From what information you gave (the weight), I'm guessing that your 84 Sovereign
is atleast a 29' or 31'.. Right?
looking over the "dry weight" of both sizes, shows the weight to be, respectfully:
1)Sovereign 29'=5300 lbs
2)Sovereign 31'=5400 lbs
So, where are we getting 6,900 lbs from?
It would seem that you're carrying a large amount of weight un-necessarily~
You might want to look into trying to reduce that.
(Maybe you're picking up rocks along the way??lol)
I tow a 84 Sovereign
, 29' with a 3/4 ton Suburban with a Hummer diesel engine and, personally..
I'm not sure I'd feel comfortable towing with a shorter wheelbase than that.
Good luck to you..