In addition, the BlueSea unit has a mechanical backup switch that works without power and is capable of locking out the remote. They are also 500A. The Intellitec units are 100A continuous, IIRC. The BlueSea stuff is pricy, though.
Formerly: 2005 Airstream Interstate (Sprinter 2500 T1N)
Now!: 2014 Great West Vans Legend SE (Sprinter 3500 NCV3 I4)