No-frills bike for disabled son--update

Several months ago I asked for help as I was having trouble
transporting my son's adult tricycle in my RAV4. So many of you gave
you advice that I wanted to update you on our eventual solution. My
husband showed me how to lift the bike into two sections, first the
front tire, guide it in the RAV, then lift the end of the basket at the
rear of the bike. This is easy for me to do and made the use of ramps
unnecessary. However I still had the problem of the front wheel
turning to the side and not being able to easily roll the bike into the
car. So my husband built a lightweight guide out of plywood that just
guides the front wheel where I want it to go. Problem solved! I'm not
straining my bike, my son can help with lifting when/if needed, and
we're back to happily riding!!
I did find an interesting no-frills recumbent by Wheel Fun Rentals that
I could have bought refurbished for about $400. It's similar to the
Trailmate Low Rider, but in my opinion, a liitle "cooler" looking. It
would fit riders from about 4'6" to over 6'. However, like the Low
Rider, it is very heavy and long, and would have been even harder to
transport. For someone not needing to transport a bike, this might be
a good option.
Just wanted to thank all of you for your help and ideas!!
Beverly