Sorry I can't help with the "jump start" but I recommend a trickle charger to keep your bikes fully charged then you don't have to jump start them, HD have them for around $100
You can buy jumpstart rated pigtails, never seen or used them but they are out there.
Thanks mate....I did not know that. I always thought that the pigtail connection, was not strong enough, to carry that type of boost of power. I have the HD power pack, and it does have that connection, I was just to nervous to try it.