Some of the 110 outlets in my 1999 Damon Intruder read hot and ground reversed. the outlets used to work but no longer for what ever reason. Why may that be? And would a wiring diagram help me? Could

https://recreationalvehicles.info/categories/Thor/Damon-Challenger-Owner-s-Manual/ https://www.rvroundtable.com/

Is the leveling jack electric or manual?

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Park brake on?

Look up the make and model leveling jack system online and find a manual. They often have troubleshooting steps. Your issue could be a fuse or perhaps the conditional switches that prevent powering the jacks when not in Park, Neutral, engine running, etc.

I can only suggest to try a dealer....EBAY...Amazon or even try Craigslist. Surely someone has one. Good Luck!

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Since the manufacturer of that unit no longer exists, your best option would be to fabricate your own or find someone to do it for you. If you can do some light welding with Flux Wire/MIG, have an angle grinder with a cut off buying the angle iron at a local home improvement store for @ $27 (6'x1", qty: 2). You can take it the batteries, being careful to remove the cables and batteries (VERY HEAVY), then looking for the anchors to detach the frame from the slide out tray. Simply lay the frame out, get your measurements and make a solid copy. You can also make it without welding, but it will require drilling and purchasing nuts, bolts, and washers and will not look quite as professional. Either way, make sure you protect the metal from future rusting by coating the frame with a primer and paint or get can of bedliner spray, which works great as well. As a DIY, use a heat gun to bake the coating on for a longer life. In a nutshell, if you can build it yourself, it will cost you less than $50 plus the time you take to do it. If you take it to a shop to have it built, you are looking at anywhere from $150-$200. Your choice. If you were near me, I would charge $150 but I would do all the work for you.
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Contact your local service center directly or online here

Contact your local service center directly or online here:
https://www.thormotorcoach.com/contact-us

Why type of latch? Slam latch, small key cylinder, turn latch? Small key cylinders can be drilled out. The slam latches often can be manipulated by lifting the paddle handle and using a small screw driver activate the plunger. The turn handles are tougher and I would have to actually see to configuration to tell how to access it.