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Towing - 5th-Wheels & Travel-Trailers 6.2/6.5 and Duramax towing performance? Towing accessories? Truck/trailer setup? Compare RV trailers? Trailer maintenance? Great destinations & vacations? Anything towing or trailer related.

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  #1  
Old 12-05-2004, 01:29 PM
Critter81 Critter81 is offline
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Join Date: Dec 2004
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I am looking at towing 15,000 pounds with the 3500 Durmax DRW. It is a standard enclosed car hauler gooseneck. Does anyone have an estimate on my mileage? Can anyone tell me what they are getting towing with thier 5th wheel or gooseneck enclosed trialers
  #2  
Old 12-05-2004, 03:22 PM
MIKE WIENER MIKE WIENER is offline
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Join Date: May 2004
Location: L.A. CALIF.
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I tow a 1200# fithwheel. I get between 10 to 12. It has a lot of frontal area it is 12'8 high. the hight of the trailer plays a big part in milage. I have a 01 3500 CCDRW DA. Hope this helps you get a idea of what to expect.

Mike
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  #3  
Old 12-05-2004, 04:02 PM
David Utz
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With a 14,000 pound 5th wheel, I average 10 to 12 mpg. The worst was 7.8 mpg doing 75 with a strong head wind. On a trailer with lots of frontal area, "speed kills". Ten MPH slower can get you another mpg. It's not so much the weight, but the aerodynamic drag.
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Old 12-06-2004, 03:45 AM
djrogers djrogers is offline
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Location: 1406 Bates Rd. Ionia,Mi.
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Critter: I have a 2001 2500HD ext. short box and tow a 36' Holiday Rambler Presidential GVW#12400 we went to Florida last January from central Michigan traveling thru Ind. Kentucky, Tenn. and Ala. and upon arrival I totaled up miles driven and gallons of diesel used and averaged 11.8, My truck is equiped with a "Banks" system. So I am not lacking for horse power, my greatest concern is stopping, I prefer this truck as to a dulley for the manoverability and the MPG when not towing.Dave
  #5  
Old 12-06-2004, 07:45 AM
CaptainSir CaptainSir is offline
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Join Date: Jun 2003
Location: Excelsior, MN
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I too get between 10 and 12 mpg towing my gooseneck horse trailer. It usually weighs about 12,000 pounds. Headwinds really do make a difference.

On another note, technically speaking, with your 11,400 lb gvw on the truck and the 15,000 lb trailer, you need a commercial, Class A drivers license to legally drive the combination. Plus, again technically speaking, you need to have a formal commercial vehicle inspection on both truck & trailer. Lots of hassles I wasn't aware of when I bought my truck and trailer. Too bad the dealers don't tell you this but it's not in their best interest.

I tried lots of ways to get around the regs but was unsuccessful. Check with your state DOT for further info. My understanding is that many states are really starting to crack down on the whole commercial vehicle issue.
  #6  
Old 12-06-2004, 11:35 AM
Scuberboy Scuberboy is offline
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Join Date: Nov 2004
Location: Lake Dallas, Texas
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I haul a 1992 27 foot Prowler 5th wheel with my 2004 2500HD Duramax 6.6 and 1000 series Allison. The trailer no where near loads the truck. The combination is UNBELIEVABLE. I love it. Fast, slow, up hill, down hill it doesn't matter this truck hauls it. Now I want to get a new trailer. Like everyone else I want all the trailer I can get. But still be safe. And I don't want to be a frieght train going down the highway. I want to pull with relative ease and not be nervous when I get to where Im going. As I shop for the new trailer I get different ideas on what I can and cannot pull. Wether it be the trailer dealer, GM dealer I get conflicting numbers. If I am figuring this correctly I have (Total)to use, 1700 lbs which is king pin weight and me (all load) in the truck. So the way I have been calculating it is to allow 700 pounds inside the truck/bed and 1000 pounds on the king pin. As I do this many of the trailers become "out of limits" as most are 1100, 1200, and 1400 pounds. I then begin to look for spring stops, air bags, overloads assist items etc. MY question is "Is there a site where I can read how varous trailers weigh on the king pin etc." Or perhaps there is a simple rule of thumb as I look at these trailers I can pull my pocket calculator out and see what I can and cannot pull?
I have been taking the total weight of the trailer and looking to see if there is some way to get 10% to 15% ONLY on the king pin. The manufactors do not want to discuss much of this. When I ask "How much weight is on the king pin" The dealer say's "You need to ask the manufacter about that but it is suposed to be around xxxxx" I don't want to know "about", I want to know exactly what IM doing. Any ideas are greatly appreciated. Reply here or on my personal email.
J.R.
LKFLNOW@hotmail.com
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  #7  
Old 12-06-2004, 03:37 PM
richp richp is offline
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Location: Geneva, IL
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On fuel economy, my 2001 K2500 with 90k miles has been right in the 10-12 MPG range its entire life when towing (which is about 2/3 of the time). Fuel quality, wind, temperature, but most of all speed are the determining factors in how much you get or don't get on fuel economy. I agree that you seem to lose about 1 MPG for every 10 mph over 55.

On the pin weight thing, you can get in the ballpark with formulas, but I would point out that in any case it is not a fixed number. For instance, I have a 40 gallon water tank at the very rear of my fifth wheel (a Jayco 32' with an actual weight on the scales of 11,500 pounds loaded for a long trip including a full fresh water tank). When full, that fresh water tank weighs 320 pounds -- which offsets a pretty large fraction of that amount on the pin. (Not all the 320 pounds is offset because the pin is farther forward of the axles than the tank is to the rear of the axles.) On the other hand, my waste water tanks are forward of the axles, so if I travel with them half full (which could be 3-400 hundred pounds of black and gray water) and the fresh water tank almost empty, I have more weight on the pin than advertized. See my point? Where you have food, water, personal effects, spare tire, dutch ovens, and all the tools in the storage bays will impact the pin weight.

Now, having said all that, my Jayco's actual pin weight was exactly 1,200 pounds the last time I weighed it (960# on the rear axle and 140# on the front axle). The trailer weight was 11,200#, so that is a shade less than 10 percent on the pin.

It's a tough nut to crack, but if you are really worried, then the ideal thing would be to get the dealer to take it to a scale and weigh the rig -- truck and trailer, axle by axle. And then weigh just the truck (both axles). With a little math, that will give you not not only the pin weight, but the actual weight of the trailer, which often is under-stated by the RV dealers. Then you have to work from there on whether your truck will have the flexibility in its capacity to handle that big a trailer.

For what it's worth.

Rich Phillips
Member #27
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Rich Phillips
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09 K-2500 Standard Cab
Universal Fuel Filtration
Cedar Creek Silverback 33RL Fifth Wheel
In The Past: '82 6.2 Jimmy Blazer, '93 6.5 GMC K-2500, '01 DMAX K-2500
  #8  
Old 12-06-2004, 05:56 PM
Ed Hill Ed Hill is offline
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Join Date: May 2002
Location: Ft. Pierce, Fla.
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I pull 36ft H.R. 5th wheel w/3500. Don't know weight of trailer - GVW is 14,400. Mileage usually ranges between 8 and 10 mpg.
  #9  
Old 12-06-2004, 07:11 PM
dmaxalliTech dmaxalliTech is offline
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Location: Holland, MI
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Hey djrogers! I see your from Ionia... I am in your neck of the woods, drop me an email and maybe we can hook up and talk shop someday
eric@gmdieseltech.com
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  #10  
Old 12-07-2004, 03:34 PM
MWALKER MWALKER is offline
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Join Date: Dec 2004
Location: ORONO,ON, CANADA
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I HAVE ABOUT 8000 MILES ON MY 04.5 DRW. MY 25FT FLAT BED HAS NOT LEFT THE TRUCK. I PULL 4000 POUNDS EMPTY TO AROUND 15,OOO POUNDS FULLY LOADER AND AVERAGE 10-12 MPG LOADED AND 15-16 MPG EMPTY.
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