Like several others have said, mine stays on the MH, locked on with an appropriate locking pin.
To do otherwise IMO defeats one of the main advantages of this type of tow bar - the convenience of keeping it on the MH and not having to take it on and off and stowing it somewhere.
We do have to take it off every once in a while, when:
1. Entering a campground I know has steep inclines or other hazards that could cause the tow bar to scrape.
2. The very rare occasion where I need the MH hitch receiver for a bike rack and will not be towing a vehicle that normally carries the bikes.
Yes, a determined thief could cut the locking pin and get it. Of course, they could also easily break open any of your storage bays and get the tow bar or anything else they want there. If they want to rob something from you bad enough to cut a locking pin or any kind of lock...Welllllll, they're going to get it or something else valuable from you, regardless what you do.
If the rare 'determined' thief is going to hit my RV, I'd much rather they take outside stuff like that and stay OUT of the MH, rather than them break the door lock, come in and ransack the inside and steal stuff inside!
This is also one of the advantages of keeping the MH at home in our driveway instead of storing it. You're much, much less likely to have theft issues of any kind, than you are when it is in storage lots.
Will and Cheryl
2021 Newmar Baystar 3014 on F53 (7.3 V8) Chassis ("Brook")
2018 Jeep Wrangler JK ("Wilbur")