My understanding (not from first hand engineering experience I’ll hasten to add) is that the 153s have always struggled to maintain air pressure as they only have compressor. As all other Sprinters have at least two compressors and air pressure is a continuous line, one slightly suspect compressor would be ‘carried’ by the other contributing a bit more. BR of course did the 153 conversion as cheaply as possible and elected to avoid the expense of installing a second compressor. The poor air pressure is evident at the slow rate of brake release, often resulting in a squeal when initially starting from rest and a poor rate of initial acceleration.
The point I’m coming to is that running alone, the air suspension also has a tendency to be a bit low, which means you get less damping when the track is bumpy. Presumably that means when running in multiple things are a bit better, so hopefully the jointed track on the WHL won’t compromise things too much. The low linespeed will probably mean it is tolerable at least.