Originally Posted by Binther
We have a 2020 Atlas we've used only twice on 'getting to know it' trips of a few nights. Now we feel ready to go farther, longer. We'll tow a Jeep Cherokee, and our total weight for the semi-loaded Atlas is 10,700 so I'm thinking it will end up around 11,300 or less. I've installed a TireMinder system and am confused about the correct cold pressures for the tires. Both stickers on the Airstream say 61 front and 58 rear. The 58 seems low to me. I haven't looked on the Continental tires yet to see what that says. Any advice is appreciated. If it matters the Jeep is 4200 pounds and is flat-towed (the Atlas towed it through the N.C. mountains fine, and I used the paddle shifters to downshift when needed).
The Continental tires that came with your Atlas are E rated and you don't need to replace them until there are worn out. Then get the appropriate Michelin LT (Light Truck) tires as replacements. I'm now on my second set of Michelins after I wore out the original Continentals. Now have 130,000 miles on my Interstate.
The pressures on the stickers are appropriate and represent the best pressures for your Atlas. 58 psi for the rear duals is fine. I run mine at 55. Lots of folks say run these tires at maximum on the sidewalls - but that just results in an unnecessary harsh ride.
You are however running a bit heavy. The GVWR for your Atlas/3500 Sprinter is 11,030 lbs. and the Combined GCWR is 15,250. Based on the values you posted you are slightly (270 lbs.) over the GVWR with 11,300 lbs. With the Jeep you are at 15,500 lbs. or 250 lbs. over the GCWR.
It is a common problem for Sprinter based Class C motorhomes. I wish the manufactures would use the new 4500 Sprinters that have higher GVWR of 12,125, but the same GCWR of 15,250.
I recommend you get a full RVSFE weighing of all axles so you really know what you are dealing with and stay safe.