frame/chassis strength '72 31ft

sorry to raise this question again ... :) just purchased my first airstream, should probably have gone with a shorter model but loved this 31 footer i found. my drive way is steep and the back end ground out, just towed it up and with the angle that's a little off camber too, one side completely lifted off the ground by about 6" .. all the weight was on the back right corner of the frame and the other wheels, i put a large board on the ground under the far right corner of the frame so not dig into the asphalt. No damage to the body or anything, wondering how strong the chassis is and if this could result in serious damage. i need to build a "bridge" to support weight evenly on both wheels but easier said than done I'm sure !

anyone insight on chassis/frame strength would be most appreciated. not sure how these trailers are constructed, assume they sit on fairly solid metal chassis?



thanks in advance:)