As long as it's 12 volts and it will hook up it will do fine.
other than special exhaust manifold specifically designed for marine use, the lifter galley on the marine block is teflon coated. an RV type cam is used in marine motors, but those can be changed.
charge the battery
Tilex. Then rinse, but don't use ArmorAll afterwards. Get Meguiars rubber and vinyl #57 (RV and Marine)
According to the 2006 Jeep Liberty Owners manual a two wheel drive Liberty CANNOT BE TOWED!
The 2012 with a 3.7L has a rating of 5000 pounds.
As long as the battery fits the holder and the terminals are oriented correctly you can install the largest CCA battery you can find.
the best way that i know is to buy the small trailer unit that supports the front wheels of the jeep, but a trailer shop can modify the vehicle to accept a tow bar, i think some changes will have to be made so that the front wheels will turn with the rv.
You can purchase portable toilets for RV's at InspectAPedia.com
That depends on the RV. Some use diesel fuel, some use gasoline, some even use propane or CNG.
under the second step as you enter the RV
Yes, put trans in park And transfer case in neutral.
For private use, no state requires a CDL for an RV.