Well let me chime in on a possible solution to your runway. If there is a paper mill within 100 miles of your location you might give them a call to see if they will let you have one of their worn out DRYER FELTS. These are nylon type woven fabrics that are about 1/16th to1/8th thick and tough as a woodpecker's lips. They range from the machine width of usually 20 to 30 feet and anywhere from 200 to 700 feet long. They are obviously heavy at around 900 to 1200 lbs. These felts have no chemicals in them and when worn out they are usually sent to the dump. I work in a mill so I was able to get one for a former club and it was great. Weeds may grow on top but you just kick them off as the roots will not grow into the fabric. Anchor them down with ribbed deck nails at odd angles and never go over them with a lawn mower. It will last for about a century or two.