Can I ask why you had to replace the back and now the front brake drums. How many miles are on your coach??
I own a 2002 Windsor so I'm curious. My brakes & drums look and perform fine. I have 100k on my coach, most are highway miles (for at least the time I've owned it). I use the Jac Brake religiously, even slowing at intersections, off ramps, entering speed zones etc.
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi