I need to put a hitch on my truck to tow a light (around 4000 lbs) travel trailer.

I've only got the 4pin wiring.

Is it easy to bolt on a hitch and to change out the 4-pin to a 7-pin/4-pin connector and put in the needed relays and brake controller yourself?

 

Hitches/receivers are pretty easy to find. Get a class III/IV. It's nice to have the extra capacity if you ever need it... Are you going to be using a weight-distribution hitch setup? If so, then I recommend going with a hitch that mounts to the BOTTOM of the frame. Most hitches for the NBS F150's mount to the side. But the problem I've found with those (I've went through 2 of them) is that the upward pressure from the w/d causes the receiver to tilt upwards, due to the fact that there is "play" where the hitch mounts to the side of the frame. If you go with a bottom-mount hitch, then there's no room for play... My most recent (and current) hitch is made by Freidl. Rated 10,000lbs with w/d. Seems to be working very well for me.

 

For the wiring, you can go to the dealer and get the harness and mounting bracket for a combo 4/7 pin. It is plug and play. No cutting or splicing of wires. Hardest thing to do is screw in the bolts for the bracket and for ground.

 

Here's the adapter like what you would need

http://www.etrailer.com/mm5/merchant...ategory_Code=A