[JRTJH]

I'd be very cautious about traveling with the bed in the up position with a thicker, heavier mattress than the OEM version and "taking Keystone's word that it'll be OK".... The first thing they are going to deny if there's a problem is the warranty repair. They'll simply refuse to cover it on the grounds that the "owner installed a mattress that was not designed for the space and the mattress is what caused the lock failure and the split frames on the cabinets".....

If you're "strictly OEM" and follow their advice, then you might have a good shot at getting an approval, based on what your dealership sent to Keystone for approval, but if you've "modified the Murphy bed" (installing a different mattress is a modification) then all bets are off with regard to Keystone fixing anything that goes wrong with the bed or the locking system....

You may never have an issue, then again, the wood that the lock is mounted on may split on the next trip..... This is a situation where, "Do you trust Keystone to do you right?"