Dick,
I think that you are overcomplicating the problem, because 75% of the time the switch is the reason for a front slide failure. Also, the rear slide almost always fails because of either the switch or the slide motor brake. The way to fix the problem is to get a good DVOM (digital volt/ohm meter), and check the circuit to see where you are loosing power. If there is power to the rear slide motor and it does not work, the motor brake needs repair.
On the 2000 Thunder, the front slide was standard equipment, but the bedroom slide was optional.
Gerald