Now might be a good time to get the Mag-HyTec pan, which uses an O-ring, and has a (I'm NOT making this up!) REAL DRAIN PLUG! Its baffling and fins along with its aluminum construction really make a difference in cooling.
Shoving my 8T motorhome (with about 100 sq. ft. of frontal area) loads a tranny, and the M-HT pan has lowered temps underway by 20°F. This is substantiated by the fact the temp when creeping in a long highway backup runs around 160°F. When traffic speeds up, it goes back down to the usual 140-145°F. Part of that is due to the pump circulating more, but it's much less than the engine temp; the cooler is in the (very large) radiator.
'94 Barth 28' Breakaway M/H ("StaRV II") diesel pusher: Spartan chassis, aluminum birdcage construction. Peninsular/AMG 6.5L TD (230HP), 18:1, Phazer, non-wastgated turbo, hi-pop injectors, 4L80E (Sun Coast TC & rebuild, M-H Pan), Dana 80 (M-H Cover), Fluidampr, EGT, trans temp, boost gage. Honda EV-4010 gaso genset, furnace, roof air, stove, microwave/convection, 2-dr. 3-way reefer. KVH R5SL Satellite. Cruises 2, sleeps 4, carries 6, and parties 8 (parties 12 - tested).
Stand-ins are an '02 Cadillac Escalade AWD 6.0L and an '06 Toyota Sienna Limited.