Summit x3 double or citi mini gt?

[twinboysmom]

My boys will be 5 on our next trip in May. We rented a citi mini double this last trip in August and it was fairly difficult to push. Now that our boys are bigger I think we need something else and I don't want to bring our BOB. I noticed kingdom has the summit x3 double. It seemed like a good alternative for us. My boys are around 40 pounds each right now and I am not certain how much weight they will gain between now and May. I wouldn't think more than a couple of pounds each. We don't plan to use buses at all our next trip (and we don't use the trams in the parking lots). Just plan to use the boat from fort wilderness and I know we will need to fold the stroller for that. Anybody have a recommendation?