Bummer on the bike. I will say that when I was a kid my dad built a trailer out of scrap pine 2x? and plywood. It just sat behind the shed for years and thats where we kept all the soda cans that we drank and whatever scraps of aluminum he collected from work (construction) Maybe once a year or so we would air up the trailer (not bike)tires on it and pull it by car to the recycle center about half a mile away. The trailer never got pulled more then ~20 mph if that but it held up for many many years of sitting outside in rain and whatever and having a pretty good load on it. So I believe the pine should hold up fairly well.