Some dealers provide a prep package to include Battery, Sewer connection hose and some sample products. Battery would usuallly be a 12 volt.
My dealer included my hitch with installation including an in the bed power cord connection. Of course you are paying for the hitch but it was a better price than I could find.
I agree with Old Farmer 2 6 volt deep cycle for dry camping.
Al Laura (Lily & Breeze Portie Girls)
2011 F250 6.7 PS Tuxedo Black 4x4
11 305SKP- TPMS- RideRite air bags
Reese 16K Slider Wet Bolts