How much are you willing to put into the trailer after you get it? An early 70's single axel sitting for 5 years is going to require some post purchase investment. Most likely the axel will need to be replaced. Tires for sure and most likely the brakes and bearings will need work. The propane bottles will need to be upgraded or replaced as well. Refrigerator, water heater, water lines and everything else need to be tested. As far as the dents go, are you willing to live with them or will you want to repair / replace the dented pannels? I don't want to scare you away from this trailer, but you need to look at the total cost of owning a vintage trailer.
I suggest you do a good inspection of the trailer, see what needs to be replaced and do the math.
WBCCI President 2016-2017