Unless the weather is really bad and the lake is too choppy, you should be able to easily get an
ECV, wheelchair or stroller on the FW/WL boat launch from MK. There is a specific open area in the back of the boat where you can wheel to. Also, they put down a little ramp to cover the 1 or 2" gap between the boat and the dock. It's quite safe and very convenient. Much easier than boarding the buses, I would imagine.