I have a Bison 2-horse bumper pull straight load horse trailer that I purchased new in 2000. The steel chassis corroded to the point that the rear axle completely separated from the frame as the trailer was being pulled down the highway. Fortunately, the trailer was empty and the speed was low, because otherwise the consequences would have been devastating. In fact, just a few days before that, I was pulling it at 65 mph on the freeway loaded with 2 full-sized race horses. Other problems over the years have included excessive deterioration of the loading ramp, side doors and rear windows, and frequent light and electrical failures. This trailer is complete junk and the manufacturer has refused to take any responsibility. Litigation is likely. Be warned. Bison trailers are cheaply made, very hazardous, and not worth the money.