I have to feel sad for anyone who hasn't been in a good convoy in PR before its an awesome experience especially when it works. One thing that PR did well was increase the teamwork and communication within squads so that game play revolves a lot around working as a squad, for example sticking together as a squad increases your points massively and being in a squad gives you access to multiple weapons. To take it to the next level similar concepts could be applied to Vehicles to create a more team orientated use of them. ie. no solo Logi rushes, solo squads roaming in Humvees, APCs speeding off and doing raking up kills instead of helping the team. I think just as working together in squads has advantages so should working together in Convoys and formations.
Team orientation is the corner stone of PR after all so why not extend it more to vehicles? Points for resupplying and transporting troops are good examples of encouraging team orientated vehicle use in PR but more should be added.
Just in the same way squads work team work points should be increased/multiplied for:
-keeping in proximity with friendly vehicles.
-killing enemy's while in proximity of friendly vehicles.
-Destroying objectives while in proximity of friendly vehicles.
-Being in proximity of friendly vehicles while moving.
Obviously the proximity thing wont be so small you have to hug the vehicles in front of you its just so you are rewarded for teamwork as a vehicle(infantry aren't the only ones who can exhibit teamwork).
Some other additions would probably have to be made such as reducing the anti-vehicular radius of Arty IEDs and bomb trucks which would be balanced out by correcting the RPG deviation. these two changes alone would
1-make being in convoys less of a "death trap".
2-Straying off alone a likely way to get picked off by an RPG.
in other words these additions would increase teamwork, make game play more immersive and make the game play more realistic.

Maybe we wont need a new game mode just to see some more convoys.