If you go with the Torklift tie downs and get a Torklift super hitch extension, it must be installed first.
It's not really difficult (it only took DH 2 hrs to install ours).
Synergy_51 has some old threads that contain pictures of his installation. They were very helpful.
We got our tie downs, hitch and fast guns from Tweety's. They had the best price and free shipping. Very prompt service.
We couldn't be happier. Good luck finding the right TC to match your truck. You'll find loads of help on the TC forum. Ask lots of questions and read everything in the TC university.
2011 Adventurer 910FBS truck camper,Torklift tie downs,Fastguns & Wobbl-stopprs
2012 Dodge 3500 DRW 6.7L CTD,4x4,LB,CC,auto,3.73 axle,General 17" on/off rd
2008 Lund 1825 Explorer Sport,115 Merc,9.9 kicker,Torklift Super Hitch,42" Supertruss
USAF ret E-9&E-7