I recently picked up a 'cherry' condition, cherry-red Adams Trail A Bike for $19 at a thrift store, and went to the Trail A Bike site to download the manual. In it, it indicates that a cro-moly seatpost on the bike is advised, not a steel or 'thin' alloy post. Has anyone had any seatpost issues with the trailercycles? I understand the issue of no more than 85 lbs. on the trailercycle, but are there other forces or stress I should be concerned about? Thanks!