Lots of it available in Victorville, CA. It is very heavy, but there are some 5' sections available also. It will not hold the weight of anything larger than a small lawn tractor! It is meant to be supported full length by soft ground and provide traction and flotation, not weight. You can weld some tubing along each edge to increase weight bearing capacity, but even that is marginal.
As an aside, the very british "sand channels" also are not designed for bridging, and need to be supported underneath.