I always leave the coupler hooked to the ball when we're in a campground. Just get a good padlock on the couple latch, and your normal locking hitch pin in the shank.....I don't ever leave the shank/trunnion head in the truck receiver. In today's tight parking lots, it would be very easy to "bury" that trunnion/ball in the side of somebody's car....
Old age is coming at a really bad time!
1996 34' Excella 1000, interior totally redone, 2003 Dodge/Cummins HO, U.S. Gear exhaust brake, Diablo tuner, 115 gallon aux fuel, Bedslide, Airsafe/Reese Dual Cam, and a bunch of other stuff