I reckon if you are going to go to the expense of building a ramp it should be indestructible and the only type that I know that is is an earthen ramp.
I know it is not possible in some locations but I have seen a few burnt down by vandals and others rot away over time an earthen ramp is there for good all it needs is a bit of weeding every now and then. _________________ Sonic 165
My youtube channel
There is an art, it says, or rather, a knack to flying. The knack lies in learning how to throw yourself at the ground and miss. … Clearly, it is this second part, the missing, which presents the difficulties. ~~~Douglas Adams