Reese dual cam problems
For the spring bars that I have, the length doesn't seem to be directly related to weight rating - - the 500 pound bars are the longest with the 350 pound bars being the shortest. I suspect that it may be more an issue of age of the bars. I seem to remember being told when I purchased my first trailer in 1980 that there were two different length spring bars available depending upon which model Reese hitch was installed.
After quite a long wait, I did finally hear from Reese Engineering with a response to my query regarding minimum weight issues with the Dual Cam system. Their reply was that it wasn't so much an issue with trailer weight as tongue weight. The system requires at least 400 pounds tongue weight to be effective. If your Overlander is anything like my '64 model, that shouldn't be a concern as my hitch weight on the Overlander varies between 675 and 725 pounds depending upon how much gear I have loaded.
With the 750 pound spring bars, I drop either three or four links again depending upon how heavily loaded the trailer is - - typically this means drop four when traveling to the International Rally - - towing with the '99 GMC K2500 Suburban with 10,000 pound trailer towing package.
Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)