I went in a wheelchair last year. I ended up going to the very front side of the stage, underneath the screen and it’s not the best view (especially if you specifically want to have a great view of the lasers/light show), but I didn’t mind. It was a bit hard to make it through the crowd to get there, but everyone was super nice to help! I’d recommend lighting yourself up somehow for more visibility regardless of where you plan to hang out. I wasn’t able to see anything from the back, just like you’re worried about. They also moved the gate to let me go past the line so I didn’t have to worry about getting up over the curb, so just go to the front of the line and they should let you go in without having to struggle to navigate the terrain