Yes, a 1990 has foam flotation built in. That foam, over several years time actually absorbs and holds water. Since the water is in the foam it's usually not noticeable until you start poking it with a stick or some tool. Water weights over 8 lbs a gal. When I removed the foam from my 1996 V21 I filled (2) 55 gal drums with it, and all of it was saturated. If you have a leak on one side and the foam is saturated on that side it could very easily cause a list. (Just something more to look at) 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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