Car dealers use ozone. According to google, it can be done on RVs. Google: "RV cigarette smoke removal ozone" and see what comes up.
Here's one
video and discussion on an
RV forum.There is a procedure that must be followed. Damage can be caused to some materials so they need to be removed. The correct amount of ozone is very important. Smoke will have gotten into heating and AC ducts. I would only even remotely consider this if getting a pro. to do it, maybe if the seller would offer a money back option and if the TT was an absolute smokin' deal (hahaha, too funny, ROFLMAO :B).