5 x 8 2000lb axle trailer in Want Adds

I was intending to build my own 5 x 10 trailer for a tear but saw a 5 x 8 in the paper that was advertised as new with a 2000 lb axle. Being in Juneau...that may be a deal. Any hints on what to look for? I would want to extend to 10 ft to save "cramped head syndrone" and "5 ft is the minimum for me and my sife complex". All suggesions welcome...BTW...Dean's 1947 vintage camper is my alternative!!!