For: My folks did this but not because they thought it would be a cheaper life style, it isn't.
They bought their 5th wheel several years before dad retired and lived in it on some acreage where dad built a big shop/storage/2nd bedroom. The day after he put his last day in at work they were off. For 9 years! It was glorious and mom had tons of good memories
On the sad side, they did put stuff in storage, which was flooded in one of those 100 year storms, by the time they got back to it everything was just fungus and mold.
Not for: All that said...A good 5th wheel is expensive. They have care problems you don't usually discover until the damage is done. How many blue tarps do you see over RVs sitting in someone's driveway? It is because they often leak. If you are thinking used, there won't be any dealer service for back up.
How big is your pickup? It takes a big engine to pull that weight, and be very careful not to stuff every compartment full. Not even of fabric
Fabric is heavy dead weight.
You will get about 10-12 miles to the gallon on the road. If your goal is 300 miles away that is about $100-120.00 dollars in fuel for that day.
Have I said traveling is expensive? Forest service camps are inexpensive but also mostly dry camps with no power.
So you'll be using up your propane rapidly, is that an expense you've factored in?
I'm only saying this because you indicate you are already strapped for ready cash. It is a wonderful dream, but it can be nightmareish on a pinched budget. A mid-range campground w/hook ups will run $30-40 a night.
Lots of people snow bird in their RVs, they find a place they like in the sun and stay in one spot for some months. My folks loved the KOA in Wickenburg Arizona.
If you decide to do it, as mentioned above, kit some projects, maybe 10 maximum and get rid of the balance. stash value is practically nil when you need to get rid of it, a sad fact people are just beginning to recognize. If you have time start listing it here...
I really do wish you all the luck and fun in the world, but better to know the pitfalls before you pull out.
Oh, there is also a number of website that will set you up with campgrounds where you can get paid while staying, or barter for rent.
https://www.google.com/search?q=Yuma...per+employment