Front Airbags not filling at idle??

Firstly, your gauges read the wet tank and the dry tank,you have a wet tank and then a dry tank, most motorhomes have a supply tank too - which makes 3 tanks. The rear air bags will fill with the dry tank, the front air bags will fill from the dry tank or the supply tank. Most air bag systems will not inflate until you have at least 80 to 85 PSI. You might be in to much of a hurry to leave, always do a pre-trip/walk around and let it warm up for 5 minutes. Maintenance might need to done on your air stabilizer arms.
If you need help with that let me know.

Crazy Canuk.
See you on the road