To many variables to give you a definitive answer. Do you have led bulbs in the lights or incandescent? Is the battery a true deep cycle or combination start/deep cycle? What's the age of the battery?
I had 2-6 volt golf cart batteries in my RV and was able to boondock for a week with conservative use. Some people can run a battery down in a day. Your truck battery should be able to power the tongue jack. If you complete discharge a battery it shortens the life.
Parasitic drains,even your frig will use power on propane for the electric portion, radio, propane detector, and other small draws. A conventional batery can be discharged in as little as a week from parasitic drains.