If shore power is not available, go solar. You don't need that much wattage to keep the batteries charged. For around $400, you can install a 100-watt panel, 20 amp MPPT controller and wires. The reason for the overkill on the 20amp controller is because you will probably add more panels later. If not, go with a 10amp unit.
As long as you don't have a lot of parasitics, you will be good to go.
2013 Silverado 2500 HD Duramax/Allison Tuned
Aviator Wright Flyer #1919
"First In, Last Out". 11B4Y
DAV, MOPH, VFW, 5/7 Cav,1/8 Cav Assoc.
11th ABN Pathfinder Co. N7MIP