What Dave said, call up TSM as he posted. Firstly they are very helpful and will spend all the time you will need on the phone with you. Secondly their kits are well thought out and put together. Thirdly they supply their kits to other sellers, so often you are buying their kit anyways.
E Brake, I went around on this one thought about a driveshaft brake but eventually went with the cadillac caliper option which comes with the ebrake feature. Furthermore they even make a kit to which you can mount two calipers onto, why well the cadillac caliper has slightly less surface area on the piston so if you are concerned about braking force then you can mount a regular caliper for regular braking and a caddy caliper for the ebrake only. I wound up purchasing the double mount kit and for now am installing just the caddy caliper only but it leaves me with the future option.
ABS will be OK, you may have to install an adjustable proportioning valve in the rear leading line if you find that they are too strong so to speak. In my conversations with TSM they say that in their experience the customers find that it works well with the trucks current proportioning setup.
Do not ask me how mine worked out because I still have yet to install it.
97 K2500 Suburban, 3.42, 245 Tires, Custom Oil cooling lines, Snorkel Removed and 4" Heath Exhaust and Crossover. TSM Rear Disc Conversion.