Brace up the roof where its supposed to be and repair the fiber glass. Then re-frame.
The first thing you need to do is get a big white board and draw a line down the center.
While working on the trailer list all the things you need to do to make this trailer your happy place.
Then as you go along sort the priority on the other side of the line so your working and spending money on the most important stuff first. You have a camping deadline of July so gut the trailer, repair the floor, repack the wheel bearings, run trailer wires for the lights
side markers turn signals and license
. Make side markers functional. Check and assess the tires
and spare. Make sure they are safe.
if you have them and get your tug ready to tow. Then move inside and research what structure is supposed to be there to support the roof. Now is the time to add support for an air conditioner even if you don't plan to use one. Now add the framing to support the door and the roof. At this point it is now safe to use as a hard sided tent so you can camp and contemplate how to get your list done given the constraints in you day to day life. Nothing is more pleasing than crossing stuff of the white board. Work in day to day goals and stop focusing on the whole picture. Small accomplishments keep you more motivated than big dreams that don't seem to get done. This also keeps you from spending money on the stuff you don't need yet and being stopped because you don't have the money you need for parts to keep you going. Yet you have a big pile of parts that you can't put in yet.