Big trucks are Macks; there are a couple of Renaults, a Crossley and I think a Model T or two as well.
The bus is the Corgi Thornycroft in general livery.
The open topped car is a Daimler (inspiration from a similar one done by a bloke on Steve Dean's site a while ago).
Drivers...there is only 1 (I need some more) and this was an unidentified WW1 figure with a cast on steering wheel I had in the bits box. I am on the hunt for more figures to convert; all help gratefully accepted here....
Crew....various; Woodbine French converted, Foundry Darkest Africa converted, the jerrybuilt Flammwagon uses Artizan Sky Pirates with weapons chopped out, the triple A Crossley bloke is a Brigade Lewis Gunner number 2 converted, there are other various Artizan Thrilling tales figures that went on as is or were converted, the Sloppy Jalopy chauffeur drives the Daimler, the heavy mortar crew is Copplestone Chinese with new heads and shoulder boards, the lorry mounted field gun is a Copplestone Brit Officers with a new head and scratch built white Russian cap, his number 2 is, I think, a Renegade WW1 Chasseur heavy mucked about with, the blokes on the bus are Copplestone conversions.
The heavy AA gun is scratch built on a Pulp 37mm, the lorry field gun is Eureka, the Flammwagen flame projectors are scratch built.
Vickers AA and straight Vickers are Pulp and Company B and any other guns are Pulp.
Stowage is Historex British WW2 and German WW2 with added bits from the Tamiya Oil Drum set as well as some scratch built stuff.
Hope that helps......