Some large truck stations offering weighing (Black Cat) are specifically constructed to only weigh by axles, not individual wheels.
This kind of limited weight information is better than nothing, as starting point. The goal for any new RV owner is to weigh at each wheel to make sure your load is balanced and within manuf limits.
There are many resources available to do this but usually not convenient.
I've had mine done at FMCA rallys, some have talked a state weighing station into getting it done by wheel. Some larger truck repair centers will do it for a fee, etc.