Check Suspension Light While towing

[bigrob49er]

I have a 2002 Expedition, 4X4 EB with 17" wheels. I am towing a 22' Travel Trailer that is under 6400 lbs loaded. After an hour of driving, I get a "Check Suspension" light. I pull over and I see that everything looks fine (it looks like the back end is a little raised). I think the system is telling me that it cannot level out. After I cycle the switch under the dash, it seems to be fine for a while then the same thing happens. Anyone know if this is OK? Am I damaging the Air Ride suspension?

 

[bigrob49er]

Fixed it!!

Talked to a buddy. He said my Weight Disp Hitch wasn't tight enough. I cranked that thing on there and no more light while driving. Now, If I sit on uneven ground for long enought the light will go on.