Not sure where you are located but, yes they simulate the weight with sandbangs and balance it on a four corner scale. I think they charge like $200 with an alignment.
Shop is Evasive Motorsports in Santa Fe Springs, CA
Suprisingly after the inital install, the car was already 48/52 for the weight dist. Or course i had them raise it quite a bit (i was like -3” ) and they re-adjusted to a perfect 50/50. Whole different animal now
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