Originally Posted by semievolved
looks like you've solved this but it made me curious why you didn't experience the same flex with the DRE towers if the frame was configured the same? i too have been running those towers on a 16' cat for 11 years and 5 GC trips and i've never noticed any flex. i'm not the strongest rower out there though and i use pretty flexy sawyer polecats so i might not notice it.
I think partially because this frame is about 6-8" longer, so there is a lot more length of that side rail to flex and twist. Also, I never ran that frame without polymax decking on it, so any pipe flex or twist was not visible. The speedrail towers are pipe, as long as those set screws hold they won't budge. The nrs towers definitely have some flex where the dre don't. I think the cross brace will solve this.
I do like the burlier attachment of the dre tower though, as opposed to a single nrs ubolt. Why not 2 ubolts?
Test run #2 in 2 weeks, and after that, it is all GRAND!