Private sale - What to look for / inspect

I would want to verify everything works properly. Fridge in both modes, ac, heat and plumbing checked and pressurized in both city and pump. As far as the smell is concerned if the tanks are closed up, traps full and toilet holding water in the bowl the smell should be gone. If not, as someone else mentioned you could be looking at mold. If you do not know your way around an RV find someone who does. There are many things that need checked. I would walk the roof, and check the floor very well above and below. Also sitting at a campground for three years I would be worried about critters or any possible infestation it may have had. That could also be the cause of the smell. I agree with others, without even looking at the tires they need replaced. I believe trailer tires need replaced every three years. Others will disagree.

I could go on all day….so much to look at.