new guy with an old trailer

It is actually in rough shape inside but the price was right..........free :-) I got it from the original owners son who didn't care about it and just wanted it gone. The skylite in the bathroom is broken allowing water in and pretty much destroyed the bathroom. My plan is to strip as much of it to the studs as necessary to repair the damage and get it "good enough" to use. I'm not expecting the ritz, just a hunting camper. :-) Does anyone know what the original tire size is for this? it has rotted car tires on it now.

Kevin