With five vehicles stored all over the place, I have a lot invested in just the batteries and since it can be up to two years before I get to drive some of them, it is pretty important to keep them charged. All have reasonable amount of solar input so the house batteries are OK and I have triklstarts or equivalent to keep the engine batteries charged as well. The triklstarts feed current to the engine battery any time the house batteries are reasonably charged so even during normal camping with good solar input, the truck battery is always more charged than normal so turns the motor over faster too.
So far, so good.
Slightly off topic, latest toy is a F350 with a Bigfoot camper and I have added extra solar and house batteries and the next enhancement will be to run heavy two core cable and suitable isolators from the engine battery direct to the house batteries to eliminate the huge voltage drop involved in the current thin wiring which runs from the engine to the rear, then back to the front left of the bed and into the camper and over to the right rear of the camper to where the batteries are. Couldn't design it worse if they tried.
