@SoundGuy:
I don't know much about car and truck engines. What risks am I running by charging this way? I am talking about 7 days in 6 months, about 4 hours per day, sometimes less. Lengthy discussion in another thread left me with the impression that, as long as the engine does not get over-hot and I do not run down the chassis battery, it is ok. Is that wrong?
I do generally park in the sun. I don't go to places where AC is required (don/t like humidity), and I don't hang out in the rig during the day, so I don't care if it gets hot in there except for the effect it has on my fridge/freezer. I don't think it gets above 90 in winter sun, with the windows cracked. Maybe not above 80.
I'm leaning towards solar, but might just start with another battery, first. I am cheap... and I don't really want another system to maintain, solar OR generator.
