Went from a 25 to a 29 and found no difference in mileage or towing on the road. The problem is when making turns,you just need more room. My real problem is parking and leaving room for the slides because trees can be in the way. More length,bigger slides,more room needed at campsite.
2007 Tundra DC 5.7L
Reese Dual Cam,Prodigy Brake Control 2008 Northshore 295 BS-DSL
Wheelbase of TV compared to length of TT makes a huge difference in stability on the road. There are guidelines for you to use for towing TT.http://www.articlesbase.com/rvs-articles/hitch-your-trailer-how-trailer-length-affects-towing-stability-431929.html Here is one article to view. There is also an online guide for wheelbases and how long of a tt they can pull.
1997 GMC Yukon, Firestone Airbags,K&N Intake,Flowmaster,Tekonsha P3, Hensley Arrow,Mckesh Mirrors,VR3 Rearview Camera.
2009 Cougar 29BHS X-Lite,Kippor 3000W Generator(quiet as a Honda but cheaper).
Twin Girls who hate hotels....