The Flames of War rules for LRDG Chevy trucks state that crew can dismount as rifle teams. Personally I don't see the point of swapping a vehicle bristling with heavy machine guns for an infantry rifle team but the option is there if the players can see a use for it. I've modelled my dismounted crew on small bases (the same size as command units) with two figures per base.
I've only painted six bases because I expect them to only be on the games table for a short while and probably never more than a couple at the same time. I couldn't find any irregular infantry figures to represent the varied and unconventional dress of these men so in the end I opted to use regular British Desert Infantrymen.
As well as allowing crew to dismount if they wish I also plan on allowing crew a chance to survive if their vehicle is destroyed, similar to the rules for passengers Dismounting Under Fire from destroyed transport vehicles. Many of the detailed action reports I have read tell of LRDG crew calmly leaping from wrecked or burning vehicles and escaping capture by evasion or by mounting other vehicles. I really wanted to show this in my game and decided I needed to tweak the existing rules to reflect the toughness and daring of these desert warriors.