jumper cables : Heavy Duty 12 foot
2 good batteries in your rv
2 good batteries in your pickup.
we camp off the grid
we leave home with fully charged batteries
we turn our pickup around and run off of all 4 batteries .
the pickup moves every 2nd or third day .
when we return we hook up all 4 batts again .
we do not run the pickup just to charge the batteries.
not mandatory but you can switch to exide Edge AGM batteries in your pickup.
and you can switch to two 6 volt GC2 for your rv .
we do 9 days with this method for the last 15 years .
no solar.
no gennie .
i disconnect the fully charged rv battery cables when i store the trailer.
that extends battery life .