Can't answer the weight question directly but you'll be distributing the weight over four mounts, and you could get a third pair to beef it up even more.
I have been considering getting a third set of control towers to go with it.
Here's how I'm reading what wreckdiver is referring to: Static - when it's parked, unfolded and full of two people plus sleeping gear (RTT + occupants + gear). Dynamic - when it's all buttoned up and on the road (RTT + minimal 'always in the tent' gear). But of course, stoic is right that for a given set of equipment/capacity, static load will be less than dynamic excursions.
Where are you seeing the 165lb limit from Yakima ... if it's specified on a particular product page (like a set of towers, for example ... or a single bar) I'd assume that's how it applies. I've also always thought that the weight limits on factory (and aftermarket) racks tended to be driven by dynamic capacity ... that static could be pushed a *bit* higher, but a call to their customer (or technical if they have separate) help line should clear up the confusion.
Also: great pics and trip report, thanks for sharing.
That is exactly how I was trying to describe it!
I saw that limit on a few different websites. I couldn't find any hard and fast numbers on Yakima's site, but that's because they require you to select a vehicle first. I've seen people mount their RTT to the Yakima racks before. I'm not putting the tent on the roof, so I'm not worried about the stress on the truck itself. The bed sides are built like a brick *******house, so I don't really have any concerns about them being able to handle the weight, especially if it's spread over four to six mounting points. Based on what I'm hearing, I don't have much concern about it.
I have two Yakima bars attached to my ARE camper top with the control towers in a track system and two Yakima bars over the cab on my stock roof rack. I can say that I've had my ARE topper fail before and never had the Yakima bars or towers fail. I think Yakima just has to put these low numbers out there to satisfy the lawyers. Yes different forces on the ARE and Yakima, but what did my cap in was washboard roads and a load on the camper caused the fiberglass to delaminate where it was c-clamped to the bed rails. I have also bent Yakima bars with a load but there bars are prone to rusting from the inside out and that is what happened to my bent bars. Now I treat my Yakima bars with a sealant to keep the corrosion at bay and I've not had a problem since. Multiple boats, and other gear, timbers, ladders and the random mattress during a move and no problems on my current set up. I do have four bars total and eight attachment point to distribute the weight, so if I were you I would get as many bars as you can fit under that RTT. Three seams like you would not have a problem at all but two would most likely work just fine.
BTW I'm loving the truck.
And this is why I'm not concerned about their strength. When the truck is moving, there realistically won't be over 140 pounds supported by the racks. My concern would be when it is set up in camp, but from what I'm reading it sounds like I don't have much at all to worry about. Especially after reading your results. Thanks for the heads up on the potential corrosion issues, I'll keep that in mind!
I would hope two would work, but I think three might be the way to go just to be sure.
Thanks! I was wondering when you were going to chime in.