The best advice I can give Segwaythedoor is to get a qualified electrical engineer to design and build the system for you.
Although you are getting a lot of advice from this site, you need an engineer to work through the details, to ensure that the system not only functions properly, but is safe for you and your workers. Providing any other advice to a person who is obviously has little electrical background is inappropriate, in my opinion. An on board charging system requires not only high-current DC, and 110 AC. There are a lot of people who tinker with electricity, but you are running a business, in Wisconsin, with USA liability laws.
Seriously, get a qualified engineer before you either burn your van/trailer to the ground or kill someone.
Perhaps I missed it, but isn't there still the question of whether any charging system can fulfill his requirements? Based on his statement, the worst case is 1 bar remaining, 30 minutes to charge, then a 6 mile tour. We don't know anything about the characteristics of the tour. Hilly uses more power than flat. Fast uses more power than slow. Nor do we know anything about the quality of the batteries.
The rate of charging is dependent on the Segway on-board charger, and, as I recall, the state of the batteries, including temperature. It would be really inconvenient for Segwaythedoor to spend a boatload of money and STILL not be able to meet the need.
Some experimental testing might be in order to determine whether the 30 minute charge is capable of doing what Segwaythedoor wants. Again, get an electrical engineer.
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