Almost a year ago I bought my 2013 Tacoma SR5, four door, short bed, V6, with towing package. The plan was to tow a 5th wheel Scamp. A used 5th wheel Deluxe Scamp suddenly showed up for sale
and I was in a hurry to get it, so after agonizing over it for a few days, I mounted the hitch myself. Here are the pictures of how it came out. The hitch kit came from Scamp ($490 + $90 s/h). I had to get four simple 3/8 inch flat steel parts made by a shop that builds custom trucks, drill holes in steel, cut the rails shorter to fit the bed, etc, but in the end it was not too difficult to do. The hitch is mounted using four of the six bed mounting bolts, so it is connected to both the frame and the bed. The SMC (sheet molding compound) that the bed is made of is tough and will never rust like a steel bed, so I think over long term this is a good arrangement. I wanted to share the pics in case they might help here. I have also written a step by step how I did it, I can post it if there is interest. It seems that I can only upload four pictures at a time, so two more are in the next post.