Geobiker wrote:
...None the less when towing between LA and Albuquerque at the end of day 2 (Albuquerque) the Honda batters is completely dead.
Just saw this where you said day 2, and it made me wonder about one other possibility:
Are you traveling for 2 days, maybe boondocking one night or stopping for a few hours at one point, and leaving the Honda hitched up to MH during that time? Do you have to leave the Honda ignition in ON or ACC while towing?
If that is the case, you may have a situation like I had on the Ford Taurus and Ford Fusion hybrid I used to tow: When towing, the towed vehicle's ignition had to stay on, in ACC position. This would drain the battery over course of a few hours, which is why I had to install a charge line when towing.
Any time we stopped for more than an hour or so, I'd have to go in the towed vehicle and shut the ignition off and put it in park to keep battery from draining. Then, before we'd hit the road, turn ignition back on and shift tranny back into neutral.
If I didn't do that, battery would run down after a while even with a charge line. That is because when MH ignition shuts off, in most cases after a short time, power to that charge line will shut off and no more charge going to your towed vehicle.
Anyway, just thought I'd mention this as one other possibility.