http://www.ebay.co.uk/itm/TAKOM-1-35-GERMAN-CIVILIAN-CAR-BMW-WITH-GAS-ROCKETS-/131486140863?pt=LH_DefaultDomain_3&hash=item1e9d2f49bf
http://www.ebay.co.uk/itm/1-35-
REVELL-ZIL-131-03245-424g-/201339606136?pt=LH_DefaultDomain_3&hash=item2ee0c69478 Paint this in civvy colours as these are used.
http://www.ebay.co.uk/itm/TAKOM-1-35-SCALE-JAPANESE-MADE-SUV-MODERN-TOYOTA-2007-/141654664230?pt=LH_DefaultDomain_3&hash=item20fb46a426
http://www.ebay.co.uk/itm/DIOPARK-1-35-ITALIAN-CIVILIAN-MOTORCYCLE-125-PRIMAVERA-2-Kits-in-the-Box-/141658287621?pt=LH_DefaultDomain_3&hash=item20fb7dee05
http://www.ebay.co.uk/itm/DIOPARK-1-35-1970s-MERCEDES-BENZ-200D-CIVILIAN-GERMAN-CAR-MODEL-KIT-35013-/400857926600?pt=LH_DefaultDomain_3&hash=item5d54fe8bc8
Another option is for 1/35 diecast vehicles and weather, adapt as you need.
If you went 1/43 there are diecast vehicles like this: http://www.ebay.co.uk/itm/LADA-RIVA-2107-dark-blue-scale1-43-Kalinka-Laika-Nova-Fiat-Seat-124-family-/291445764242?pt=LH_DefaultDomain_3&hash=item43db857092 plus more modern.
Si