I was going to do the battery box, but decided to take my old tow chain and use that to secure the battery boxes. It is one continuous length that weaves through the 2 battery boxes. If they stole a generator from an RV, odds are they can get through any battery security you put in place. The chain will keep the non-professionals (just looking to make an easy snatch) away and they may move to an easier trailer. Inside are 2 Trojan T145 6volt batteries.
Here is how I looped the chain between the battery boxes 9see picture). I bolted the front end of the chain to the security chain bolt.
2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package
Our Solar Album http://www.jaycoowners.com/album.php?albumid=329