I heard a story of a big heavy person needing to have their car aligned with them sitting in it, because the weight of the driver was enough to throw the alignment of the little car out of wack.
That was probably me.
It was a Chrysler K-car and the driver was a giant; both in height and in girth. We put the heaviest duty Struts on that car that we could find with monster springs.
And I bagged everything we had into that poor front seat, and a 5gallon pail of leadweights on the floor! But after it was all done, and from time to time, the guy would show up and thank the boss, again. That car still listed to one side, without his nearly as big wife in it, lol. But it was aligned with the list in it, so he was a happy happy guy.