There are 3 types of wheels on cars I have run on my RR.
1. All plastic wheels... These get swapped out right away to all metal wheels for better stability esp in the wind.
2. LGB plastic wheels with metal rims. Ok most of the time and much better than plastic outdoors, heavier than plastic but lighter than solid wheels.
3. All metal (solid) wheels, very heavy and run really great especially on long cars. Mine just happen to ne USA Trains, but there are others available.
There is a very noticeable difference on the solid wheels weight than the LGB metal wheels but I like the LGB wheels on cabooses at the end of a train as it makes the ccaboose lighter than the other cars.
Also, long cars/engines do not like side to side uneven track especially if the truck is long. American 4 axle Freight cars tend to have short spacing on the trucks but your long passenger cars do have long spacing on the trucks and are more critical of side to side leveling.
My worst case rolling stock for testing my track is the Aristo RDC and the SD-45, and the RDC is more sensitive to uneven side to side uneven track.