Best way to level up driver? Enjoyable =/= Fast?

So in the latest beta I wanted to go nearly full on driver as I ve tasted humvee in previous beta. I managed to get to Ivl 25 few hours before beta ended and next levels were a breeze with machine gun humvee I ended up at level 28 but still till level 25 it was kinda boring running ural logistics runs through the entire matches sometimes as almost nobody chooses to drive cars when there's few helis waiting at HQ with 13 empty slots. Unfortunately this makes the ural runs fastest way to level up driver at the beginning. I found out that sticking up to the end of the game seemed to grant you quite some exp as well. I wonder if anyone have actually looked at exp numbers and could say if I'm wrong or right on this one. Obviously getting 5 people to cz/hz with Kodiak would be significantly faster and more enjoyable but good luck getting constant passengers even when there's your friends playing. I know this might change with early access release as things will not be condensed anymore and cars might become just slightly less overlooked but i guess unlocking humvee will be just as uncondensed.

How about you? Are there any drivers here? What was your take at unlocking humvee with machine gun in the beta?