Clutch options for heavyweights

Aiight, so now that I have my SWing drivetrain running pretty consistently, I'm planning out its future.

From my research here, I'm finding the stock clutch is great for a stock-ish bike, but if you plan on hauling around a bunch of weight (like riding two up with a weekend's worth of her hair products and shoes) something like the Dr Pulley HiT clutch set might be preferred.

anyone out there have experience with pushing heavier than average weights with an aftermarket clutch? anyone have any suggestions on what springs I ought to start with?

As noted before, I just have the drivetrain and associated electrical bits. My current plan is to use the SWing engine to power a car's transaxle, using the SWing's clutch pack and bell in place of the car's original flywheel/clutch/pressure plate assembly. All told, the car should weigh in around 1750, especially since I'm replacing the all cast iron 40HP 4 cylinder with the SWing's twin.

Barring any other info, anyone have a link to other idiots who have used the SWing plant for non-SWing purposes?

While I'm not exactly "light", I dunno how much is "heavy". I've been using Dr Pulley's HiT Clutch for at least 45,000 miles, and I wouldn't be without it. It can sometimes initially be a PITA to sort the springs, but given that you are cobbling together some kind of prairie schooner art car, who'se to say how difficult it's going to be for you.

Tim