Check the axles. Look under and across to the other side the trailer. There is an arm from the axle tube to the spindle. I suspect you will find that arm is trailing upward as it goes to the spindle. If so the axles are DEAD. They should be pointing downward at about 15 degrees.
When I bought my 91 they were shot and only 4 years old. Mine had 11 ins. clearance when th trailer was sitting level and I had trouble on some railroad tracks.
I you do replace the axles I would suggest you consider Dexter.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles