[rotor_wash]

I haven't been able to confirm my 3124KS weights using a scale yet, but I used a weight and balance formula using stock weights provided by TM and added different known weights at known stations to get total and tongue weight. With everything full (propane, drinking water, propane, thetford charged, hot water full, a/c, awning, 2 T-105 batteries in rear, and solar panel) except gray water, fridge, and personal gear, I have the following:
Total - 3809LB
Tongue - 507
Center of gravity (CG)- 27.3 inches forward of axle
Lateral center of gravity 17.4 inches left of center line. (!)

Adding your personal gear forward of the axle also will increase tongue weight, but placing all 4 T-105 batteries in the rear storage as close to the center line as possible will reduce my mathematical models tongue weight to stock 490LB and increase total weight by 130 lb. Your mileage will probably vary.

I was surprised at the left side lateral CG, and wondered if that has anything to do with blowouts.