Yep. Buy some extra battery mounted leads so every vehicle has a pigtail to make it easier to just rotate the Tender every week or so. Hell, I also bought a long extension cable to plug into the battery lead that I fed through the firewall into the back of the 80 to power the Envirocooler (low-draw fridge). Keeps me from having to run dedicated power all that way for just a single, low power device.
They also sell a USB port (~$10) that plugs into the BT lead. Handy on my 40 that I've not run any extra power. Let's me charge or run something overnight while sleeping without draining my battery pack.