My games on location would never be so far out of level side-to-side that anyone would try to fix them in that direction. And if they were, please do fix it!
But, I removed all the bubble levels because occasionally someone would come jack up the front legs to center the bubble, and then it would play slow, flat, and terribly. Dear person: you've made it worse and are not the People's Hero. I've seen someone walk up to a game, look at the bubble level, and then say to their friend "this isn't level" as a way to brag.
PSA: YOU CANNOT TRUST THE BUBBLE LEVEL. If you center the bubble on most NIB games, your game is now way below the pitch at which it was designed for.
Anyway, I have steepened games on location that were unbearably flat. I justify it by telling myself that the operator set it up correctly but some other person came in, looked at the bubble level, and made a stupid adjustment on their own.