@sdog
in simuconf.tab, set "enforce_weight_limits=1"
@james
10 settings doesn't seem so bad.
Vehicle weights would need to be kept for acceleration behavior, but this seems to be much simpler than an axle load number. Either would require another line in the depot display anyways. The best part is, a lot of the locomotives are already categorized.
I think roads would only need 3 or 5 settings, since all trucks and buses must fit within specific limits that are set by the department of transportation (or whatever it's called locally).
Early vehicles would get 1 to 3, while current vehicles would get 3 to 5