I say dually and here is why.
Over 100 gallons of fresh water is over 800 lbs. That tanks location is important to know as far as pin weight is concerned. That tank location also really impacts the truck's rear axle weight.
When that garage is unloaded that model will be nose heavy. and brochure weights are always bare. No battery, no spare, no water. You need to look at the actual unit to get the correct shipping weights.
At 43' you will be jacking that thing pretty far to get in a lot of sites, long bed for sure or a good auto slider hitch that will add even more weight.
You should also visit dealerships and compare the weight rating stickers on real trucks between both manufacturers and single/dual setups. Don't trust brochure numbers, you will be surprised. I just went from one 14k GVWR fiver to another 14k GVWR 5er. The first one was within specs on a Ram diesel 2500 quad cab long bed. When I scaled the newer 5er with the same truck I was over on rear axle, cargo, and combined gross vehicle weights. I now have the same truck down to color but a 3500 dually.
Most of all have fun once it's all done and you can go RVing.
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2005 Cummins 2WD 3500 LB CC dually 2014 Blue Ridge 3025RL
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