You should not have to rebalance any tire/wheel unless you are:

1) correcting a poorly-balanced first effort
2) drag racing your ML at the strip running 4psi on the rears and doing burnouts prior to staging, and
3) suffered severe tire/rim damage (i.e., bent, curb rash), in which case, you probably have to replace one or the other, so a balance would be necessary.

Don't use it as a crutch to in an attempt to solve (or mask) other possible suspension-related ailments, either...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car