cyclone 4012

Hi recently bought a 2008 heartland cyclone 4012

the axles are flipped already but it drags really bad on dips to the point where the rear landing gear doesnt work anymore. I was wondering what id the biggest tire size I can fit on the trailer? currently running ST225/75R16 tires.

also has anyome put any micro roller wheels on the rear of the trailer to prevent frame damage or any other damage?
 
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