Had this happen to our first trailer (15')when it was about 15 years old. It was winterized and in remote storage and we did not use it the next year since we were on the boat almost all weekends available. When we went to check it the forward marker lights were broken, the top of the awning was shredded and water had intruded and messed with the luan junk that was the walls. Actually the siding was not noticeably dented and the roof was aluminum so there was no intrusion there except for the trashed plastic black tank vent cap. It cost $400 to buy it back. Everything worked, A/C, water, heat but the fridge quit shortly after and since a replacement was more expensive than the trailer at that point we opted for a small 110VAC fridge and an inverter. At some point we sold the trailer for about the cost of keeping it. We had another few trips before selling and the buyer did not need the hitch equipment so selling the WD and sway control hitch separately more than paid for the repairs we made. Oh, the shredded awning was the old type, no tabs to pull down, so we salvaged the rod for the roller and had it spliced into the leader portion.
My opinion, if you like what you have and would have kept it for another 4 years or so, it ain't gonna get cheaper than this. Do check about salvage title, I bet there is no problem other than a required inspection that will essentially review the frame and running gear.
Good luck