First of not CTs would drive the truck, but are in the back. Just like the Docs would be in the ambulance version.
But to anwser your question:
Does it cause those problems with the REQ tent?
Because the Logistic version of the Truck will likly be similar to a mobile REQ tent.
Ordering supplys and handing them out.
They cant just deploy on their own, so running off to be in the Truck without any notice is a no.
Any shipside personal needs permission from their superior officer after all if they wish to deploy.
And if that permission can be reclined at any moment, if they dont come back the MPs are on their ass and possibly, tepending on their behavior, even admins.
Also, like i mentioned the ARC exists. And that vehicel has only 6 people that are even able to drive it at MAX each round. Most rounds less, because that requires a full CIC.
And it doesnt have that problem of SOs only joining to drive the ARC, and then not doing their job when they cant drive it. They migth be butthurt about it, but there wont be a big figth about it.
Yes, SO need to follow the rules even more wich is one reason why this doesnt happen with the ARC.
But even CTs can be arrested by their supperior officers for not manning the line or just ignoring their orders. So if a CT feels butthurt and doesnt want to do REQ work, they are arrested. If they cryo, CT slot open.
So no, i dont belive that would really be a problem. Because there is nothing that would point to this being a problem. All other similar cases show this not really a thing.
Thank you for listening to my TED talk.