[Festus2]

You might want to try the "usual" auto supply retailers, tire distributors and you can also get them from a variety of on-line sources that sell locking lug nuts. The propane tanks can be chained (with a grade 70 chain) and locked to the frame. Just make sure the lock is as good as the 70 grade chain. What do you plan on doing with the batteries? If you are planning to leave them with your TT, you should try to secure them as well. There is a thread currently running on the forum on "Stolen Batteries"......you might want to check that out (It's in the General RV Issues section of the forum).

There isn't much you can do to eliminate theft --- if they want it badly enough, then it will be gone. All you can do is to make it as difficult as possible and perhaps if they see that it will involve too much work, they will move on to something involving less effort.

How often do you plan on visiting you unit while it is sitting there? If you are going to be leaving it there unattended for long periods of time, I wouldn't be leaving anything valuable inside or in any of the outside storage compartments. It doesn't take much time and effort to gain access to those compartments.