I own a 7ft wide R-Vision 26ft Trail Lite Travel trailer....no slide outs. The width is great for tight spots but the length has resulted in my passing up a lot of possible tight Forest boondocking locations.
I do however enjoy the interior space and extra storage offered in a larger unit. The Trail Lite is only
3,300 lbs plus all my stuff and 40 gals of fresh water. My tow vehicle is a FJ Landcruiser, 6 CYL, 5 speed automatic with heavy duty trans-cooler and rated to tow 5,000 pounds. It does the job well and most of the time I forget that I even have the trailer connected.
Back in 1985 I towed with a 4 speed manual transmission and hated every minute of it....never going down that road again!
Happy Camping!