Slightly OT...why does a 3500 lb trailer have a 535 lb tongue weight? I realize that the batteries and LP tank on Airstreams are on the tongue.
As an aside it appears that AS hitch weights and GVWR have been increasing over the years. If one "really" wanted to they could probably tow a 31' footer with the MX.
1975 Sovereign 31' GVWR 5065 Hitch Weight 495
1982 International 27' GVWR 6000 Hitch Weight 490
https://www.airstream.com/wp-conten...g-coach-trailer-motorhome-weights-guide-7.pdf