My DS is 5 1/2 , (46 pounds, and about 45 inches tall) and rides in a Recaro HBB full time. We have run into a situation where about one time a month, my co worker who has a daughter in my son's class will be picking him up and taking him back to her house. It is a 3 mile drive on surface streets. Would a LBB be okay for such occaisional use, and what ones would you recommend? Thanks!