We are traveling down to Orlando with our almost 5 year old twins. They will be in booster seats with the high back. Does anyone know if there is any way to add a try onto the booster so they could color, play with play doh etc.? I have plastic trays we bought from Michaels they use for eating while sitting on the couch and I was wondering if dh drills a hole on each side and using elastic cord, if he could somehow get the trays to stay on? Anyone have any ideas? Thanks, Linda