There have been some interesting attempts recently both to redesign ambulance interiors for allow for a tech to sit beside a patient and access all important equipment and perform all assessment, as well as seatbelt systems that support this.
http://www.aev.com/scv2/
You're going to need to access different patients from different directions. Yes, there may only be one person in the back with the patient, but they may need to access the patient from 3 different directions during the transport.
For instance, if the patient has an IV in their R arm, I can't give meds and reach the monitor from the same seat, they are just too far apart.
I heard they tried a tether system for the attendant in the back. It would retract the attendant to the wall.
I issue I have with wearing a seat belt in the back is I need to treat my patient. Often this intails moving around, moving to the edge of the bench seat so I can reach my patient and start the IV or I just have to get up to reach the med radio (it is behind the Patient) to make my patch.
But, alas, I am still guilty with no excuse because on those mundane, routine calls that do not require much, I'm not belted...
there needs to be a good belting system that is easy to wear and give us the mobility we all would like/need
Yea, but what if the monitor mount isn't on the counter?
As far as seats, CCT transports can have a lot of people on board. It wasn't uncommon to have a 4 person crew (2 basics with one of them driving, RN, and RT) on CCTs. Same thing with specialty care crews.