MOR/STOR Electrical Cable Winder/Storage

[dieselguy]

Don't have one, but for those in the know ... is this just a windup device or do you splice it into the power cable somewhere and then do you have to cut a hole in your storage compartment floor to use it??? I agree the 50 amp cable is a brute sometimes, but I usually just wind it up in a loop and drop it in the truck bed when traveling.