Well let me try to help with a few things,
1. As for a list I don't know of one there might be one.
2. Things to look for,
When your looking around the outside and it's a slick side unit (fiberglass) look for waves in the sidewall that a sign of water leak.
Look at all the fixtures see if any are loose or hanging off or not tight, grab them if needed.
Check all doors open everyone and check locks.
Look at the waste tank valves to see if they are leaking.
Look at the windows to see condition.
Look at the roof most peopls will not look at the roof don't take the salesman word that it's good. Look for sign of age chalking is sign of age but also shows it needs to be cleaned, small cracks like shattered glass look show the roof is dried out and splitting, look for soft spots also.
On the inside take a good smell when you enter now this time of the year they will be hot inside but you can still smell mold or water damage or musty smell.
Look at the floor make sure all the coverings are in good shape.
Look at the rest of the unit doors, cabinets, ect if it happen to be plugged in which most of the time there not check all systems.
3. I had a 93 f350 dually and I pulled some big units with it had no problem you should have enough truck just check the towing specs.
4. Sitting is bad for all of them not just 5th wheels if they sit for a long time years things might not work correct.
5. The dealership will or should go through the unit ask them to plug it up and run all the systems, it should have been done when they get the unit ready for pick up.
6. Class A - motorhome
Class B - coinversion vans
Class C Small motorhome ones with the overhang over the driver.
5 th Wheels
7. Some RV park do offer wi-fi just check the website or call and ask. Some have season rates others have weekly or by day rates they should be listes on the website, do a search for rv park and you will see many lists of parks.
8. RV forums will teach alot but the hands on method works great
9. There is books out there to explain more on the tech sides of systems in the unit.
Hope this helps