About an hour ago, I finished my Harbor Freight trailer with the 3" PVC, for my late 2103 Pro Angler 12. I built it from
VentureTubes YouTube video... with the Unistrut supports. It's really nice and he credits "Mofishyaker" on YouTube for the idea. I recommend you check out the videos.
I made some minor changes due to having a PA12, not a PA14 like VentureTube.
I cut the overall length of the 3" PVC to 9 feet. It seemed like the distance between the centers of the PVC is 12.5"
The PVC overhang from the rear Unistrut is 15". The distance between the Hobie's front grab handle (resting on the black rubber roller) to the coupler is 33". I also rotated the bracket that holds the roller, so the grab handle rests "in" it.
I was concerned about the wiring, so I ran all the wires inside the frame. I used wire nuts for all the wire splices... I thought the supplied HF connectors for the sidelights looked too flimsy. I sealed all the connections with "Liquid Rubber" stuff.
I had a 25% HF coupon, so with NJ state tax, and only $6.99 (six dollars & ninety nine cents) shipping costs plus Unistrut, PVC, additional u-bolts and registration/license plate, the whole thing was under $400.
I hope I got this right... this is the URL for the YouTube video.
https://www.youtube.com/watch?v=8gOONSVjTEU&feature=player_detailpage&list=TLy3ELej06REsmguuqw4oiFCbeZrA1MwET