rk911 wrote:
what happens when, not if, the keyless entry fails? the ONLY way I'd ever have them is if the door also had a traditional lock and key to use in case of failure or in place of the keyless entry.
I think all of the systems have a manual option in case of failure. That said, one of the downsides I've considered in these is that you would always need a key accessible somewhere - just in case. You wouldn't want to have a battery fail while you were out and then be unable to access the camper without a locksmith.
If we were to ever get one, I'd probably use it in the same way I use our garage door opener. Our kids can get in and out with the code, and I use the opener for 99% of my access. Still, I never leave the house without a key - because a power failure while I'm out would leave the house inaccessible. Somehow, I'd have a key to the trailer accessible at all times.