What happens if you separate the two receivers in the front cab: BB on the left, and the Pressure Pro on the right? I doubt that with the two transmitters being 35+ feet away, they are the issue. Best guess is that the offending adjacent channel interference is coming from the BB remote that is constantly talking to its host.
I'm actually surprised that these two units are interfering with each other. These 900MHz devices are designed to live with each other nicely, up to dozens in the same area. I'm just thinking that the BB return transmitter (cab remote) is just hammering (overloading) the other receiver rather than stepping on its data.
Jeff - WA6EQU
'06 Itasca Meridian 34H, CAT C7/350