I have one on the 12 winnebago we bought used. Just had to submit a $2000 claim for a fuel pump failure and some related work! Do not buy from the dealer, I have the CW one and they seem to be ok now. My price was someplace in the $3000 range maybe less. The GS roadside service and tow worked well also. Your reasoning is why we bought in 1st place too many electric junk items to fail.
Normally we dont buy but with the limited use and random possibility of a failure feel it was worthwhile to get one. BTW this is the 1st time we had a roadside breakdown and it was not fun.