help on battery cut off switch and volt meter

I have read post on both of these topics. Hoping someone can save me some looking and point me to what I need to buy.

I have a new 2014 Coachmen Apex 214rb.

What I want to do is:

1- install a battery cut off switch in the + or - cable to eliminate drain when not in use. Location would be close to battery on frame.

2-install a volt meter. I figure it could be wired in at same time the cut off switch is and mounted close to the other switch.

I think the only thing direct wired to the battery is the electric tongue jack.

1-Will the tongue jack have any drain on battery?

2-Dumb question..Is volt meter wired into pos or neg or both?

3-Are volt meters available that can me mounted on the frame and out in the weather?

4-Any reason not to mount these items on the tongue?

5-Any SPECIFIC suggestions on what switch and or meter to buy would be appreciated.

Nothing big and fancy. No plans to go solar. no plans for a genny, although that is a possibility at some point. Not much boon docking planned but if we take off out west that might change some.

thanks in advance