That being said, I live near the coast, so lots of salt to be had. The trailer is a 2005 model. Would you buy a 5 year old aluminum trailer?
I would buy a 25 year old aluminum trailer. I have seen aluminum trailers that have been used HARD to haul cattle and horses several days per week that don't have any problems with corrosion. I certainly haven't seen the same in steel trailers.
I have a 95 steel stock and the wooden floor is like new. Trailer looks rough but hey the horses don't care. I have a LQ also and I wish I had gone for the stock combo. I would rather haul my horses in a stock. They ride better cause they can turn facing backwards and you can also haul alot of things back there. The aluminum floors will last if you have good maintnence practices. I put sawdust in mine when hauling to absorbe the urine and keeps the manure together. Twice a year I pull the mats out and wash the floor let it dry and put the mats back in. I do this spring and fall. In the middle times I just roll the mat up and hose off the butt wall and floor. My trailer is 7yrs old and the floors have no wear or pitts at all. And I live between the Chesapeake bay and Potomac river. Plus your resale value holds with a all aluminum. Some have steel frams and that's ok. Go to www.horsetrailerworld.com and get into thier forum you can learn alot and get great information from pros and everyday owners..