Welcome to the forums... and let me say Caravels rock!
What should you look for... first and foremost safety issues. Tires (get new ones unless less than 4 years old no matter how much tread!) check brakes, lights, hitch. Be sure all propane, etc. is off! Take your time coming home. Don't pick her up when in a hurry!
Then... I would suggest looking at the following thread. Read through the posts and you will learn a lot! So much depends on your personal style and what you like!
Caravels are often quite sought after so if it is in fairly good shape, especially the floor! You can probably get what you paid for her unless the price is really high! That way, if you feel you made a mistake later... you will be ok!
You will more than likely want to restore her anyway. The electrical will be substandard for any of todays needs! You will probably also want to make some adaptations to the sewer system... likely no gray water tank...??? but they are a great size!
Good luck and post pictures when you bring her home!
Mrs. NorCal Bambi (traveling in S Tardis)