Converting my dully to a 10 wheel drive to handle Toyhauler

That is the way to do it without expensive machine work to add another output shaft to a standard T-case. Might be a tad noisy, but heck, you are driving a 2nd gen Dodge.....you won't hear it over the engine anyway!:p What about oil levels? Just going to fill'er up 3/4 to the top and call it good?

How is the scrub while cornering loaded? I notice cornering mine with just one set of duals @ 103" wide.