ICR Transfers

After shopping around the net for a bit, we've decided just to go with ICR for our transfers. Unless we booked something like a tour bus transfer through one of the big transfer websites to save some money, ICR is actually working out cheaper given that it's a private transfer. I have a couple of questions though, if someone could help....
There will be 4 of us, how many more people maximum can we expect to share the transfer with us?
If we ask, will the driver stop for a quick smoke/toilet break at the usual rest point?
My partner may have to bring her wheelchair, will it be a problem stowing it on the vehicle? It is just a normal, collapsible type of chair with the large rear wheels (which can be detached). Even if she is requiring her chair at that time, she will be able to enter and exit the vehicle with few problems so we won't require any kind of special assistance, just assurances that the vehicle will take her chair no problems.
Thanks for any help
Paul
There will be 4 of us, how many more people maximum can we expect to share the transfer with us?
If we ask, will the driver stop for a quick smoke/toilet break at the usual rest point?
My partner may have to bring her wheelchair, will it be a problem stowing it on the vehicle? It is just a normal, collapsible type of chair with the large rear wheels (which can be detached). Even if she is requiring her chair at that time, she will be able to enter and exit the vehicle with few problems so we won't require any kind of special assistance, just assurances that the vehicle will take her chair no problems.
Thanks for any help

Paul