The bay compartment latches would need to be broken and damaged to get into them. That would immediately raise a flag. I can't imagine what a new engine or transmission would end up costing if vandalized.
It was just a thought while in the storage over the weekend. I usually back into the slot which leaves the rear out of view of cameras. Anyone could access my rear engine area (radiator). Most of the fluid fill and check points are very easy to get at from there. They've had vandalism here in the past. Some MH's were really tore up.
I rather spend the extra $20 for the cable and lock (which I have) then worry about it. It's now locked and problem eliminated. I will remove the cable and lock while traveling.