I'm in the same boat - eyeing a TC purchase for support during my racing endeavors. I'll be towing a 7k (car) trailer so I made sure to find one with a 4' tongue - figure all I need to do is re-locate the pin jack.
I've seen 18" bar extensions (Curt) and thought that may be the way to go, to get the pin out from being too far under a 9.5 or 10' camper. I know the extension stuff is popular but I figure I'm going to be heavy enough already, and hanging 7k lbs off the end of a big lever just isn't where I want to go.
This is all especially true since my truck is an antique and pretty limited on GVW - and adding 100lbs of steel truss stuff isn't going to help. I don't see a way to do a signature (yet), but it's an 86 F350 CC DRW long bed turbodiesel, 9200 GVWR.
Anyway, just chiming in to say "you're not the only one" and the above is how I'm looking at things.
Cheers,
- Jeff