Simple on/off 12V disconnect switch

[bwc]

Is there such a thing as a manual 12VDC battery disconnect switch that will separate the truck from the camper when parked but will allow 12V for the camper. Most if not all that I see do not allow any 12V to camper when turned off. If not would the Sure Power 1314 be another choice? I am happy with current charge rate, just want to keep truck and camper separated when parked. Also, would the Sure Power be installed in line of the camper's positive battery wires, 12V in and then 12V out along with a ground or does it need to be installed on the charge wire in the camper? Thanks.

[Dadio24]

Google images for "battery disconnect switch" at Harbor Freight. Less than $5. Haven't tried it, but looks very simple.

[enblethen]

This is one of the best ways to go.
Large posts are for battery supply. Small post is for connection to a circuit that is "hot" when ignition switch is in the "run" position.

Battery switch

[abslayer]

I believe once you shut truck off this happens automatically to protect truck battery from being drained.
Why would you want to change that ??