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Njmurvin's avatar
Njmurvin
Explorer
Jul 08, 2020

How much squat can I expect?

I'm looking at a new 2020 Duramax 3500 4x4 (crew, standard box). The bed rails are 59" off the ground (3" taller than my 16 year old Dodge 3500). The bed is also 3" taller than my existing truck at 39".

With my trailer leveled, the bottom of my overhang is at 60" giving only 1 inch of clearance. In order to get the trailer to ride level and give 6" clearance to the bedrails, The truck would need to squat 5". Assuming the pin weight of my trailer is about 2000-2400lbs, is that a reasonable expectation? The payload of the Chevy truck is 4185 lbs. So, I'm guessing it may not squat all that much.

I never really paid attention to how much my Dodge squats under the weight of the trailer because the trailer leveled out pretty well (maybe just a tad nose down) and there was always sufficient rail clearance.

The axles are already flipped on the trailer. So, welding on frame sections as spacers would be my only option for raising the trailer. I'd like to avoid that if at all possible.
  • Njmurvin, With your light RV pin weight, probably only a couple of inches! With a very heavy trailer pin/hitch weight you “may” get close to your needed “squat”. But, you “would not” be loved by others if you do any night driving.....your headlights would be well up into the tress. After our first trip with our Ram 3500 soft suspension towing a very high pin weight RV, resulted in night driving on low beams to replicate the unloaded truck high beams. When passing an opposing vehicle, I had to go to “high beams” to put my lights above the approaching vehicle. For our next trip.....we had air bags!

    These newer trucks are ridiculously high, and make maintaining a level truck and 5th wheel RV while maintaining adequate box top rail/RV clearance, a very difficult proposition! memtb
  • my 17 dually drops 2 inchs then I level with my air bags. If I don't I get flashed every time at night.
  • I'm not sure about your specific truck but I recall people talking about replacing the spacers on the 1 ton truck rear springs with the 3/4 ton truck spacers to get a couple inches lower.

    Never did it myself, so not sure if it's people running their mouths or if it's real.
  • We have a 2016 GMC 35000 4x4 and with about 3800lbs pin load we get about 2" of squat. Our Lifestyles RV came with a high clearance suspension and I only have 5" of bed clearance when level. Not sure you're going to be level and have much bed clearance with that setup.
  • I have found with all my trucks had several, also three different campers they all pretty much the same
  • Hey Busdriver. Thanks for the response. Is that the amount of squat you get with your GD? I think our trailers have pretty comparable pin weights.

    Is your Dmax a 4x4? Does everything level out pretty well with the trailer attached?