Truck Levels, Camper Hitched, Truck Back End Sinks

[ChevyBurbLTZ14052]

I have a 2007 Chevrolet Suburban LTZ.
I tow my camping traiiler with it.
Other times, for just when the entire family is going somewhere.
Last year I had the Air Compressor for the suspension system replaced after a message popped up on the DIC that said "Service Suspension System".

This last time, after I hooked up my camper, the compressor kicked on, leveled out the truck, but after sometime driving down the road, the back end sagged. It did not remain level.

Also, there was no message on the DIC that said anything about the suspension system having an issue. Two questions, what could be causing the truck to not remain level and, if this were a suspension issue, why would there not be a message on the DIC saying so?

What parts, if any, of the suspension system would cause this issue, for
the rear end to ride low after initially being level and would cause no message of a problem on the DIC?

Any thoughts out there?

Many thanks in advance to one and all.

Mike

 

[VanGo]

Does the air level compressor continue to run and try to level the ride? You could have a leaking air system. Could be the lines to the air suspension or the suspension itself.
I just replaced the rear air suspension shocks on my Cadillac because the compressor kept coming on and pumping them up. Problem solved now.