I have the same chassis as you,,one year older with 126K miles.. I have owned it half it's life and 85K miles.. The good thing about this chassis is the method used to build it. The "stacked" frame is just that,, the chassis rails are one part of the "stack", the "house also has a set of rails that approximate the chassis that it sets on. Both rails ,,one on top of the other are bolted together down each side using large "U" bolts along there length.... This allows a certain amount of flex across the length (twist) which is good and bad.. The best part is the extra space that is created to mount all the tanks right down the center of the coach,( the fuel tank is also in the center forward of the others) The good is the flex that helps ride,, the bad is flex that will break the windshield if you park on off level or on twisted ground. Another good is very little side to side imbalance,, so you only need front and rear axle weights, and a little math, to establish proper tire pressures front and rear..
Most Flying "J" stations have the CAT scale system that you can weigh front and rear independently then add the two for the total as weighed.. Divide the front by two and the rear by four to give tire loads per tire.. You need to do this periodically because RVs gain weight over time,, In the ten+ years I've owed mine it has "gained" 750 pounds...
Your three point leveling jack system is also designed to act like a three legged milk stool,, the assumption is the front will "tilt" when leveling the rear,,BUT,, and this is important, if the front end is still sitting on the air bags as you are leveling the rear very much, the windshield go's BANG,, either breaks or pops out... It's very important to raise the front enough to allow it to"tilt" BEFORE lowering the rear jacks much,, this minimizes the twist..>>>Dan
Dan, very good information. Thanks!