My camper van won't move. It was parked up after going through a flood and is now stuck. On starting it fires up and both forward and reverse gears can be engaged, but the wheels will only turn one eighth and then it will not move forward at all. It is rather like when your wheels are up against a kerb and you cannot move forward. I applied the accelerator and the engine revved but I remained stationary and I smelt the clutch burning so stopped. Any ideas as to what the problem might be?