We currently have DS FF in a TFP. He is 40+ lbs, and 38 inches tall (last we checked, it's been about 6 weeks, so probably closer to 39 now). Next month we're planning an over night train trip with a car rental on the other end, and a long weekend at our destination, with another train trip home. I really don't want to lug a TFP on and off a train and try to install that monster in a rental car. Not sure I see another choice though. I've been looking at getting him a Britax Frontier 85, since he's going to need it before his next birthday at this rate, but not sure that's any better for lugging around, and I wasn't planning on getting it so soon.
Anyone have any suggestions? Not sure I'm comfortable relying on the car rental agency's car seats, all things considered.