I have a 2005 19' Keystone tandem axle travel trailer and (yes I know) never serviced the axles. I pumped some grease into the zerks every few years, but haven't repacked the bearings or adjusted the ...
What exactly are they doing? A simple repack with new seals? Or all new brake assemblies with new drums and bearings?
If it were me......I would just repack the existing bearings (if they show no signs of failure) and reuse the drums with new seals. And install new self adjusting brake assemblies. Shouldn't be no more than $250 in parts and maybe another $250 in labor.