Has anyone heard of jumper cables long enough to jump the boat from the truck while still on the ramp? In my case, I would need a 45' cable... any chance a cable that long would pull the necessary juice to turn over a big block? I'm storing the boat at the lake this season and don't have the ability to plug in to shore power. Suggestions? Don't have the ability to pull the batteries each trip nor can I find one of those portable units that I feel comfortable with...