I just bought a 1996 3 horse slant trailer with a tack area as well. There is quite a bit of rust and the flooring (planks) is original. I want to replace them even if there is no rot because I’m afraid of an unnecessary accident, but what all should I look for? How best to deal with rust? Also, the divider closest to the door is hard to move and seems to move a little part of the wall at the bottom along with it. Give me all your advice on making sure a horse trailer is sound!