There, all gone but one post now.
I got the dreaded "Thread not found" message, so I kept trying to post. All those extra posts didn't show up for me, but they were lurking on cyberspace, waiting for me to get off so they could post themselves.....
Anyway, I thought of some other pieces of advice:
1) If you are not ready to make the big switch to a van, there might still be special needs car seats that would work for your DD. I know that they have some in the abilitations.com catelog (although I couldn't get them to come up on search). The weight limit for some of them is up to 105 pounds. The limiting factor might be the seat size though; the sizes I could find had a maximum seat size of 14 x 14 inches . My DD is only about 85 pounds, but her wheelchair seat is 14 in wide by 18 in deep.
2) It's a good idea to bring your DD with her wheelchair along to see how the wheelchair fits in the van before you make a final decision. The wheelchair space in the van looks HUGE when it is empty, but the whole van seems to shrink once you actually have a wheelchair in it.
3) If your DD is on an MA waiver program you might see if MA would contribute to the cost of the wheelchair accessibility part of the van. (In Wisconsin, where we lived before, the program was called the Katie Beckett program. In Minnesota, it's the TEFRA program). We are not participating in the program, so I don't know if it would help out, but it's worth a shot.