Fortunately, where we live, we can still leave the keys in the vehicles and doors unlocked. Vigilante law kind of. Good way to make your way to an early grave is mess with somebody or their stuff. Maybe odd for modern times, but it is what it is in our area. Hope it stays that way. Everybody minds their own business, but yet looks out for everybody. That said though, in certain other areas, traveling, the locks are on sometimes, or the truck is in front of the rig.
I think one of the best locks is taking a 2-5/16" ball from wherever, cut the shank, lock it in the coupler and put your pad lock of choice on.
John and Rebecca Dickson
Emma-8 / Little John-5 / Iva-1+
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)