You are going to think I am off the deep end, but I gotta tell you a story. My Envoy got blown on pretty hard by a wee dust up we had down here in S. Florida called Wilma. Anyway, when it was over my control panel was all full of grit and was rendered useless. So I contacted HotSpring and, once the phones and power came back, the dealer to get it fixed. To make a long story short, it was fixed. No charge.
Buy your stuff from your dealer. After spending $9K or so for an Envoy, why screw your dealer out of his wee bit of profit on the ancillaries? You might need these people some day. Look at the big picture.
Regards,
Bill