Easy to print CCKW 352 Repair/ Wrecker Truck, 1/100 scale, will want some greebling if scaled up. Some details have been changed for looks/ printability. (Picture has both 1/100 and 1/56 printed models.)
Scale by 1.56 for gaslands / hotwheels / 1/64
Scale by 1.786 for 28mm / 1/56.