Grammy - Welcome to the forums. Mid 70's Trade Winds are great. I almost bought a 76 before I found my 75. One piece of advice is to check out the floor for soft spots before you do anything else. One spot that can be a problem on this era is the area around the back bumper. Rain water would run into the trailer from the bumper and cause the floor under the sink area to rot. Mine had a slight case of it, others can be worse.
When you have a question, use the search function on the bar at the top of the screen. If you can't find an answer, ask. Be sure to post pictures, we all love pictures!
WBCCI President 2016-2017