I would not recommend you and him making the trip back home alone in a vehicle though.
Knowing the distance from where you are to Boise, I would second this motion, and look toward air ambulance which would have bed or chair available and be much quicker, thought I’m sure more expensive. Expense is somewhat relative under the circumstances, and is something that could be shared. Then the issue would be getting your vehicle home, which could also be shared by team drivers along the route, doing 100, 200, or more miles and giving the vehicle to the next freeper team along the route. Each team would foot the bill for fuel on their leg of the journey, providing a service to you, and allowing you to travel with Jeff.
I do have a question on the tilt bed. It sounds like a fairly long term need, unless the BP and other issues I’m not aware of go away quickly. Will you need one back home?
But a tilting seat Power Chair wheelchair or scooter might make him more comfortable when sitting up. The tilting chair also helps to shift weight as you sit and relieve pressure on any given area and thus reducing the chance for pressure sores.
The reciprocating air mattress is the cheapest thing mentioned and easiest to rent and is used for the bed at home. It has compartments in it which in about a 5 minute cycle deflate and inflate. There's at least two different tubes or compartments and as one inflates the other deflates. These are mainly used to lessen the chance for pressure sores.
If a hospital bed is needed at home they can be rented at most home health supply companies or bought fairly reasonable for about $150 at thrift stores.
I can tell you how to make the bed at home more comfy. Have someone place the legs on the head of the bed on cinder blocks. Then you can put pillows between the top mattress and the box springs. I puts you in an inclined position. I did this to our queen size bed. Much more comfortable than any hospital bed.