I use an 03 Liberty sport as my TV. I don't have any real complaints about it. THe only time I really noticed any lag was when I was going up long steep hills (14-17% grade and 10km or so). I would have to gear down to 4th and occasionally down to 3rd. Lucky we don't face much of those kinds of hills.
I weighed my 13' boler
and it came in just under 1500 lbs loaded - water food and all. Just be aware that there is a difference in towing capacity between the auto and the standard transmissions. I believe the auto is rated at a VERY generous 5000 lbs while the standard 5spd is limited to 3000 lbs.
From what I've read on Liberty forums you should stay away from pulling anything close to the 5000 lb rating even with the auto tranny. Too much chance of getting pushed around not to mention the wear and tear on the TV.