My brother-in-law rented a TT last year for a ten day trip. Great way to see if you like it or not. Kind of expensive, but I know he did the math and figured it would be relative to travelling the same distance and staying in hotels, eating out ALL the time, etc... Worth a couple bucks for the experience.
Just remember that a day to load it up, a day to unload/clean may be in order if you plan to take a lot of STUFF. The dealer he found gave him the trailer on Thursday (rental started Friday) but he had to return it on Sunday, the day the rental ended.