I don't think it's a problem now. We recently bought a Reese dual cam WDH for our new 29' TT (actual weight 6600 lbs). I went through a scale numerous times and just couldn't seem to get the weight transfer right. I was using near gorilla force to wind up the original bars to get enough transfer.
I originally bought 800 lb rated trunnion bars since the factory listed dry weight is 518 lbs. But the scale ended up showing it to be 960 lbs. I ended up ordering new 1200 lb bars. I installed them yesterday as I am going camping on the weekend (DW is away travelling at the moment). I drove about a mile yesterday with the new 1200 lb bars and it is an amazing improvement. The trailer is much more stable and there seems to be significantly less bounce in the rear of the trailer.
I was originally having trouble with adjusting the big threaded cam shaft that goes into the bracket. With the chain set on 4 links left over, I could not adjust the threaded rod in far enough (forward direction). I set the bracket location at 19 3/8" as per the Reese instructions. See photo. I was thinking that I needed to move the bracket forward.
Then when I got the new 1200 lb bars, I discovered that the old ones are shorter be about 1/2" (see photo). So now I have more adustment available on the threaded cam shaft. I need to park on a straight/level spot somewhere and adjust the shaft lengths. Then it'll be off to the scale - again. Woohoo (not).
Does anyone know why the bars are a different length? One made in Mexico and the other China?
If I absolutely need to, is there any problem with moving the cam arm bracket forward a little bit like say 1/2"?
Curious - am I right in that heavier trucks, 3/4 & 1 ton require more tension on the trunnion bars to transfer weight to the steer axle? Would make sense since the spring rate is higher on heavier trucks. I don't recall seeing this discussed anywhere.