Getting your RV weighed is not too big of an issue. Most all truck stops have CAT scales. The problem with them is you are usually hemmed in by barriers and can only get axle weights. If you have a feed store or grain elevator, lumber yard, etc. you can often find a scale that would allow you to weigh each corner, or at least one side, subtraction would give the corner weights.
You might also check with the state police, they often leave scales open at weigh stations and you can drive through when they aren't weighing trucks and read the display yourself. State police also often have portable scales in the trunk of their cars that could do your weight.
The air springs are probably helper springs, not the primary suspension like many Class A diesels. Those bags are usually inflated to keep RV level when all loaded. No need to weigh with your toad, it probably puts minimum weight on the receiver if it's towed 4 down, if on a dolly, you could get the tongue weight using a bathroom scale.
https://catscale.com/cat-scale-locat...NlVBoC6DHw_wcB
Locate truck scales, truckstops, truck service centers, and diesel prices