by 'fly' i assume you mean wander back and forth in the gusts
this is in the suspension and steering, you should get it checked
traveling with full water and LP will help by adding ballast weight
if it really wants to lift off the ground, get some wings and a pilots license
and go to oshkosh fly in, you will be a big hit
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s