Trailer doesn't sit level

Here's the story I hope someone can help me with. i have a '94 Great Dane air ride trailer. I've had it a couple of years and never used it much, just a few light loads. The other day I had on 45k and I notice it was doing a some wiggling. I pulled over to check and saw that the curb side was about 2 inches lower the the left side. When going around curves or corners, the trailer would lean enough that the tires would rub cross members. The left side would not rub. Looking at the trailer from the rear, loaded, It is obvious something is wrong. The problem may have been there all the time, but may have not been loaded heavy enough to notice it.

Height difference is on both axles. Tires are all the same size and properly inflated. Only one leveling valve on center of rear axle All air bags inflate, But, there is about a 2" difference in their height (left side to right side) when inflated or dumped. I check for a broken spring, i didn't see one. Anyone have any ideas what I should be looking for under there? Thanks

 

Thanks for the reply. After reading your reply, I went back under to check around again. I think you may be correct. While under there, I had my daughter dump the air and re inflate the bags. while inflating there is a popping noise, as if something is in a bind, coming from the the right side. The bushings in the left front trailing arm are shot. I can shake it around like a pea in a tin can. I never thought of a bushing seizing, but it all make sense now. Will try to get it to the shop next week. Thanks again for the tip.

 

Trailing arm bushings???