I'm going to give you my opinion and I hope you don't take offense.
You have already bought the under floor set-up and are having trouble getting it installed. So you figure the easy way out is to spend more money on another system that is not going to be a bolt and go deal. You are going to have to overcome problems with that too.
You'll never finish the truck with that approach. Throwing more money at it isn't going to fix your problem. You need to jump in there and do what it takes to get it fixed.
I sent you a link to a site detailing the problems I had and how I solved them. That should get you started.
