I have them charge the water system, FIRST thing. Then while going through the PDI, if there are any leaks they will show up. Flush the toilet, run the shower and bathroom sink then check under the floor for leaks, you might have to remove some paneling in the storage compartment to check for leaks but these panels should come off by removing a couple of screws. I have run the water in the shower then put a piece of cardboard in the shower, walked on the cardboard and then check underneath for leaks. Water will destroy a camper and normally by the time you see it, its to late and there's serious damage. Check under kitchen sink and hot water heater for leaks. Run the onboard water pump also. Remember if you have problems after PDI, you have to take the camper back for repair. Check out every operation of the unit, take your time and don't let them rush you through it. Plan on taking up most of the day checking things out. Good Luck!!
