I'd look at Opel truck and maybe kubelwagon. Luftwaffe personnel in coveralls. There are a few sets and eduard has a set of Luftwaffe maintenance stands and ladders.
Found on eBay below.
From Dragon
Luftwaffe Day Fighter Ground Crew & Equipment Set - 1/48 Dragon - sealed/NIB
Airmodel Products 1/48 GERMAN LUFTWAFFE 1.50M AXLE STANDS Resin & PE Set
ICM has some Luftwaffe personnel in winter clothes as well.