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This should be relatively easy to figure out, but not necessarily easy to fix. I don't know how a campmobile is set up, but here goes. It is possible the clutch is slipping, the shifter may not be putting the gears in the right position inside the transmission, the drive shaft or a u-joint let go(in which case there should be something on the ground), a gear could be stripped in the rear end, or you have a broken axle. See if the drive shaft turns.If it does the problem is behind it. Good luck