I'm in the process of building a prinsu-style rack. We need to be able to put some gear on the roof for camping with a family of 5. For our trip to the mountains this winter the cargo area was completely full. It will also be a more convenient and stable way of carrying surfboards, especially during the winter when the big guns come out.
I get a bit of sag on my Prinsu in the middle, even when it's unloaded.
When you mention sag in the middle, are you talking about the crossbars? Have they always sagged or have they bent/curved from holding weight?
No I mean the side rails bow from the front to back and sag right in the middle. It’s fairly noticeable on mine and way more obvious on 5th gens. I’ll see if I’ve got a side shot that shows it
That's really interesting. I suppose it would help to load heavier items over the mounting brackets rather than the middle, and in the case of a rtt maybe having adjustable mounting feet like they do for the front of 5th gens. I just measured the deflection on the one I am building by setting it up on jack stands. With all my weight in the middle I could get it to deflect about 1/4", but no deflection without weight.
Sorry for taking so long for this, but I finally found a picture that demonstrates the bend somewhat well. This picture is from about a week after I put my rack on and maybe 24 hours after my buddy put his on his 5th gen. The only thing I had on my rack up to this point was the box with my friends rack in it. Having now had my RTT riding up top for 2-3 weeks I'm getting a Front Runner. My tent is pretty much only sitting on the crossbars at each end of the tent and there is a gap from the rack sag on all the other crossbars. This gives me a super awesome rattle when I go over bumps and the bars flex enough that it bounces off the other 5 crossbars under the tent.
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Since I've had my RTT I have had rattles and noises on my Prinsu rack. It drives me nuts and I couldnt figure it out for the longest time. I thought it was perhaps the ladder on the tent. Using a motorcycle strap I've tightened that down when it's stored but the noise continues. After camping last night I kept looking around for possible causes of the noise and sure enough it's the exact same as yours. Where the tent is tightening down there is solid contact. But the 5 or so crossbars between those points all have a very small gap. When I compress the side rail of the Prinsu and the bottom of the tent I can't get them to contact. I am 95% sure this is the sound I am hearing. Glad to finally figure it out but I need to do something as the sound kills me.
I've been thinking of attaching some padding on the RTT rails or wedging them between the rails and RTT once it's installed. Depending on the material I use once it's wedged in there I can't imagine it will work its way out.
I love my Prinsu rack for everything else so not wanting to get a different rack.
Anybody have any ideas for material to pad the gap?
I guess and other option could be to remove those crossbars. Would look kind of dumb without the tent on but they obviously aren't providing much support.
Sorry for taking so long for this, but I finally found a picture that demonstrates the bend somewhat well. This picture is from about a week after I put my rack on and maybe 24 hours after my buddy put his on his 5th gen. The only thing I had on my rack up to this point was the box with my friends rack in it. Having now had my RTT riding up top for 2-3 weeks I'm getting a Front Runner. My tent is pretty much only sitting on the crossbars at each end of the tent and there is a gap from the rack sag on all the other crossbars. This gives me a super awesome rattle when I go over bumps and the bars flex enough that it bounces off the other 5 crossbars under the tent.