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We are currently looking at 2012/2013 models. After returning from our initial look at a 3700, I found the brochure specs to be quite a bit less than the web site specs (hitch weight of 2,135 vs 2,525). That's why we are now going to look at the 3400. I used the higher numbers from the web site in my calculations.
Here are some rough translations of the forumlas I guessed at:
GVWR pin weight = (hitch / shipping weight) * (shipping weight + cargo)
TV rear gear weight = (base weight rear / base weight front) * (500 pounds of hitch, person, gear, etc.)
TV pin capacity = rear GAWR - rear base weight - rear gear weight
Safety Cushion = TV pin capacity - GVWR pin weight
Going by the spec sheet numbers, the 3700 only had 104 pounds of cushion, but the 3400 had 490 pounds of rear GAWR cushion. Actual loading will vary, but is unknown at this point. Our TV is already equipped with dual coolers, exhaust brake, brake controller, etc. As I will not be towing very often (mostly every several months and mostly in the flatter midwest area), I'm more concerned about rear GAWR and not so much about GCWR.
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