Since you are apparently renting a Class C you will need to deal with some sort of leveling. Most the rentals don't have jacks so that means putting something under one or more of the wheels. I cut some short lengths of 2x6 back when I was renting for that purpose.

If renting from a private party maybe it will come with something, if not then there are devices you can buy relatively inexpensively.

https://www.amazon.com/gp/product/B072VSBLH7

https://www.amazon.com/gp/product/B07PPC57T7

This ^^^

Here is one option: https://www.amazon.com/Camco-Leveling-Hydraulic-Frustration-Free-Packaging/dp/B072VSBLH7

Things I have purchased and not regretted:

• Camco "lego-style" levelers for tongue jack and stabilizers
• Anderson style leveling block to level trailer
• Stick on levels (so I can see where we are at when backing onto the blocks)
• Wheel chocks from Harbor Freight
• 30/15amp adapter to plug into house
• 30/30amp adapter to plug into generator
• Water filter
• Water pressure regulator
• Basic tools for small repairs and tool bag to keep them in
• Extra fuses
• Breaker bar and sockets for lug nuts and water heater drain
• Kitchen supplies (pots and pans, utensils, dishes, cups, silverware, etc.) so we don't have to pack that shit every time
• EZUP for shade