C7 quad, weak triceps, trunk control is ok, no grip other than tennodesis

I have a manual chair with the power assist wheels and I'm trying to find the right car configuration for it.
My current vehicles:
2003 Braun dodge van.
I can take the driver seat out and pull in with the wheelchair.
there is an EZ lock already but they do not make a bracket for under my ti lite chair and I have no additional way to tie down
2007 honda element
also has an Ez lock but I am not able to fit the chair in quite right

getting a car that I transfer into and break down the chair won't work because the power assist wheels are too heavy for me to easily move