We're headed to Disney in May with our three boys, my mother-in-law, and my brother-in-law. We've taken the group several times, but over the past year, my brother-in-law has gone into end-stage renal failure and is awaiting a transplant. He's looking forward to the trip but expects to struggle with the long days, and we're looking into getting a ECV for the long days at the park. It's not that he can't walk, just that many miles a day in the Florida sun will surely wipe him out. I've read some of the FAQ's from Disney but wondered if anyone had experiences to share, "things to consider," or other tips for using ECV's on the trip. Thanks for the insight!