That seems a bit unreasonable but sadly pretty typical for an rv repair shop. We also have a 2003 Fleetwood Prowler. In 2008 I took it to the dealer where I bought it for new brakes and repacking the bearings. They may have done some other minor things as well that I don’t remember. The final bill was around $850. Haven’t been back since. Since I put less then 2000 miles/year on the rv, I haven’t had to do the brakes again yet and they still work great. It has EZ lube bearings that I added grease to once or twice since maybe 2012 without issue. Probably cheaper with a mobile rv repair company that will come to your place in the future if one is in your area.