1973 FRUEHAUF 21’ SOLD: $6,283.00 1973 21’ Freuhauf Aluminum Hopper Trailer, single axle, new roll tarp, air brakes, holds approximately 550 bushel, SN-FRR524901. Call Keith Beam 937,776,2502 Xenia,OH Manufacturer : 1973 FRUEHAUF 21’ Serial Number : FRR524901