One of the things I do walking kart pits and looking at karts on the stands in addition to automatically looking at chain alignment and rear tire placement in or out is to go around front if I can do it courteously or get down and look at the right front preload.
When I see one of the three odd compared to what I'm normally looking at I watch the karts performance out on the track to see if it's good and even outstanding or not so good.
Usually, when one of those three is out of the norm except if it's a super heavy who's going to be riding on their small left rear tire, they don't do so well on the track.
Eyeball his preload and compare it to others learn a norm for it and if it's bent the oddity will point you right to it.
If the right front of the frame has it hanging down excessively there's no way he's going to adjust low cross into it with normal tire sizes.
I've never really looked at how axles are laying level-wise to find a norm for myself but after writing this I will because it may start to clue me into what they're doing with axle bearing height.
Those three things and now maybe a fourth tell a lot about how you will expect what you see will perform on the track.
I think there's also no way he can be stuck with such a high cross all the time without the right-front hanging way down or the left-front up to high unless the waist of the kart is bent, which is not likely.
Since most turns sprint racing are to the left we use to put some preload into sprint karts by putting the left front up on a brick with someone standing on the left rear, while you jumped on the right front to bend/twist the right front down some.
If you do it all the time you can pretty much feel if the cross is ok by comparing how it feels to lift the left and right front.
That's also one of the first things to check if it comes in either super fast, a toad or pushing or loose.
A scale will give you numbers but a feel for weight out will give you setup no different then driver feel out on the track. maybe???? ...