If the rear parking sensors are disabled with the van connected then the vehicle knows that the van is attached, even though the instrument trailer indicator does not light. My trailer has incandescent globes that don't light the indicator yet my van's incandescent globes do light the indicator.
There are shocks inside the air springs and they wear-out like every other shock, sooner if used on rough roads at higher speeds regularly or later if primarily smooth roads at slower speeds. I've just thoroughly worn-out a set of D3 shocks in 60K kms.
That's quite a long van!
Edit: Do you have high enough pressure in the rear tyres? Too soft can make the front feel like its wandering.
MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
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