First off, I don't have any experience with Big Foot Levelers so these are going to be very general questions, OK?
Are any of them retracting? or is the system dead? On the control box where you tell the levelers to extend or retract are there any lights? In other words, is there power at the control panel? Have you checked all fuses to make sure nothing is blown? Does your Big Foot system have a "Emergency Retract" button? Have you tried to contact the manufacturer?
Good luck, and keep us posted on what you find it wrong, OK?
Good Luck, Be Safe and Above All, Don't Forget To Have Fun
2006 Fleetwood Discovery 35H, being pushed by a 2009 Honda CRV