If you are thinking of one just for the trip, DD8 was 75# last year on our trip and shared a double rental with DD5 with no problem. The joggers at MGM are the best, the molded plastic ones at the other parks are much more crowded, they can't really sit in them properly, but one kid sat on the seat and the other sat in the footrest area. The strollers were easy to push, even with both kids in them.