Crowd: Ask Yale for their interpretation, they are the manufactuer or their authorized representative (aka dealer).
I mentioned in an earlier post when sizing a tow tractor a basic rule of thumb is one lb of "CONTINOUS" draw bar pull (DBP) can pull a rolling load of 50 lbs on a level surface (most warehouse & plants) actually have a ~1% pitch for drainage purposes) with low friction tires (say steel) at the stated loaded travel speed. Clark used to publish such an application sizing booklet when they were in the tow tractor business & had their tractors at every airport I ever flew out of for a longtime - TUG took over whem Clark got out of the business (the TUG looked just like the Clark).
Do the math following your reasoning. The published DBP of a counterbalance lift is the MAXIMUM rating of the unit - which maybe (depending on the manufactuer) at motor or torque converter stall or a 1 mph (which most Japanese companies publish) and their numbers are lower than many US brands. You DO NOT want to operate a motor or tranny at stall for any length of time unless you have a real big checkbook and down time is not an issue. I have yet to see a lift truck company publish a continous DBP rating for a counterbalanced lift truck and my career in industrial lift truck industry started in 1967 & ended in 2007 (retired) with four different companies. Besides developing tech manuals I had a very extensive back ground in lift truck spec. sheet development and evaluating competitve equipment as well as their collateral material. Granted things may have changed since September, 2007 but I doubt it. I know I have changed my hair is a little grayier, I wear glasses now but my BP is in the 120 's.