You're absolutely right Terry, I had no idea of the origins of the KERR; just to check, we are talking about the 2 inch thick Kinetic? Amazing!
I have one because at only 100hp for 4 tons on 7.50x16s powering out of a hole is not really in the list of possibilities.
Nino, on Terry's advice have the anchor points on your vehicle checked for solidity and get some good training on how to attach the rope. I oversimplified the 'give' in this excellent piece of kit, if the towing vehicle (the unknown and we must presume untrained part of the equation) starts with the line slack, as it comes tight the elasticity of the Kinetic will absorb and store the momentum (kinetic energy) of the towing vehicle rather than transmit it directly as a wire or classic strop might. Thus the Kinetic is less violent to the attachment points, but if one does give, Terry's description is in no way exaggerated.
Imho a 2wd camper isn't going to bog badly enough to cause problems pulling it out, I've pulled 1 or 2 out of british goo w/o problems, can't speak for sand though. It can only sink to one axle (driven wheels dig well don't they) and the wheels are 14 inch so that's not deep. If you prepare for the worst it probably won't happen.