My friend's grown son uses an ECV. We'd like to schedule a Fireworks Cruise at Epcot but was told by a cast member on the phone that he would have to be able to step into the boat unassisted. He can't really walk but a couple of steps and has trouble stepping down without a handrail, so I'm wondering if a family member can help him balance while he steps into the boat. Has anyone had any experience with this issue? Thank you.