This request may be a bit out there. But how about adding some new vehicle objects, used by the Aviation Engineer Battalions, and thus likely to be encountered on or near the airfields
2 1/2 ton, 6x6 truck dump truck variation --
https://en.wikipedia.org/wiki/2½-ton...2A2,3_dump.tif
6 ton, Prime Mover ----
https://en.wikipedia.org/wiki/6-ton_6x6_truck
Caterpillar Road Grater ---
http://usautoindustryworldwartwo.com/caterpillar.htm
LeTourneau Road scrapper --
http://usautoindustryworldwartwo.com/letourneau.htm
Asphalt Truck
https://en.wikipedia.org/wiki/Diamon...asph._dist.jpg
Crash and Firefighting Trucks!!!! (These are definitely needed!)
Class 135 ---
http://www.armyfiretrucks.com/135%20page.htm
Class 150 ---
http://www.armyfiretrucks.com/class%20150.htm
As far as aircraft....
IMAM Ro 37 bis
Breda Ba. 65
Fiat Cr. 32
Caproni Ca. 109/110
Type 0 Observation Plane F1M2