This is gorgeous! so you just welded this all yourself? Do you have the exact specks? I would love to make one....if I can find someone in my area to do it.I've got a 2017 RTL-E and just got rigged up with a Tepui Kukenam SKY. Any questions I'm happy to help where I can, I didn't find too much on RTT with the ridgeline gen 2 in my researching so I more or less designed what I wanted and learned some lessons. I'm coming from a camping background, have had a 16 foot fiberglass egg trailer, tents, etc.. and for my uses this setup seems to be the best so far. Very little maintenance, easy to store and setup, and can just pick up and go when I want. I've got the whole setup on a winch system in the garage so it stores out of the way and I can install and remove from the truck by myself in about ten minutes with the push of a button and some truck bed clamps.
It's only been out on one trip so far (40F, high winds, downpours for half the trip) and it held up like a champ. I packed it up every morning to drive around town (5-10 mins effort) and then set it back up again at night (5-10 mins effort). When I get home from the weekend I air it out good to dry on a table in the garage for a day or two. I'd probably want the tent mounted to a trailer if most of my camping was staying in one spot for a while so you could use the truck during the day without packing up, but my use case is typically just weekend adventures or hoping site to site so it works well for me.
It's setup so the bed rails take all the weight, and the tent folds over the passenger side. I wanted it this way to keep the height down so I could load a dog into the tent easier and just reach up and get items in and out without being on the ladder (I'm 6'). I set the height of the rack to be just enough I can fit my yeti cooler in the bed, but the tent won't stick up over the cab impacting noise and aerodynamics - I didn't really see any MPG reduction on my first trip...maybe 1-2MPG but that's somewhat in the noise..could have just been the speeds I was going. The platform is very sturdy (6061-T6 Square Tube 2" x 0.125") and the mattress was nice and comfy. I keep a deep cycle ATV battery in the bed of the truck in an AMMO can with SAE connectors to power up things like fans, lights, cell phone charger. This can charge with solar or AC power while in use and for me lasts more than the weekend on a charge.
It's still a work in progress, but am very pleased so far.