Mark,
Most Beaver coaches with a front condenser hold in the range of 3 to 3 1/2 lbs. of R134A refrigerant in their dash air system. With a front condenser, the hose length does not make much difference in refrigerant amount because they only carry either high pressure or low pressure gas. However, the coaches that have a rear mounted condenser use more refrigerant because the hose run from the rear condenser to the front expansion valve is carrying liquid refrigerant.
Gerald