I replace the entire set with Bulldog dual motor ones. Separate switches and separate breakers. Yes, you still have to be careful, but I only use blocks under the wheels if there's more than a couple of inches difference. As for frame twisting, consider what a Level-Up system does and the frames aren't any different.
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'06 F350 Lariat turbo diesel dually, Curt 20k, Softopper, Aerosheld, coolant filter, air bags
'10 3665RE Hickory, wet bolts, Trimetric battery monitor, 4 100w panels & Morningstar TS-45, still tweeking!
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