Here are a few that I have found over the past year that can get you started in the correct direction:
concrete truck - kuid 127320:25010
concrete truck - kuid 127320:25011
mischer - 3 different kuids starting at 60422:26015
pump1 thru 6 - 6 different kuids 119692:317 thru 322
cement truck - kuid 46819:27005
independant - kuid - 50567:7767296
blu circle - kuid - 50567:7767196
blurib - kuid 50567:7767396
There are some on 3rd party sites, but those that I did not list, I have no idea where I got them!
Hopefully this is enough to get your construction area kick-started!!! :wave: