Skid house runner help please

[Cheers]

I am fishing for some help please , I am building a skid house and need your advise regarding the runners . I am using 4 x6 x 12 foot  fir for the skids but would like to put a plastic or nylon runner underneath but am not sure what to use or where to get it from . I would think that it should be around 1/2 inch thick as the fasteners would need to be countersunk . Any suggestions would be appreciated 

Thanks in advance

Cheers !

[Jim Almquist]

Not sure just what you are going to pull your house over (tar road) but you can't go wrong with UHMW for a protective type cover over your runners. 1/2" X 4" is $7.02 a foot so it would run you about $85.00 a ski or $170 for both. Plus shipping

Place to buy UHMW