If they don't retract enough to be able to drive, you can manually push them back into place by using a tire block and a 4-6' length of 2x4. Place the tire blocks or piece of firewood in front of the jack and use the 2x4 as a cantilever and push the jack back into position. Many an RV'r use this method in an emergency or when the return springs weaken, while they save money to replace the springs. If the jacks are hydraulic, they can always be raised by pushing the fluid back where it came from. Just a quick tip to justify keeping a longer length of 2x4 in the RV.
