According to specs, the Battery Tender Plus runs 14.6 for "absorption", and 13.3 for "float". The Boondocker runs 14.6 for "boost", 13.6 for normal, and 13.2 for "float".
I am not worried about speed on the Battery Tender Plus. When the batteries aren't on the trailer, and it is hooked up in the garage, it will have days to do its thing. I am more worried that it is capable of fully charging, then maintaining, and not causing damage.
The Boondocker needs to be as quick as possible, since it will be powered by my generator while camping. But besides a little speed, the requirements are pretty much the same. Capable of fully charging, then maintaining, and not causing any damage.
Hopefully both of these devices will work. My life was a lot easier before I started hanging out on these forums, and trying to learn. Don't get me wrong, you guys are great, but sometimes ignorance is bliss....
Jeff