Mark Farner has done a lot of Christian stuff, in his post Grand Funk days that's always worth a listen, also. Don Brewer has been on and off with Bob Seger, since 1983, between stints with full Grand Funk reunions, and attempts to go it without Farner.
The guy probably still gets nice royalty checks for We're an American Band, as that's still a staple of classic rock radio. Yep, he can afford a Tahoe.