Question:
Are there good trucking companies in the Colorado Greeley area?
Trucking school ...
For a European driver who wishes to drive in the USA?
Experience 10 years as a international truckdriver (europe)
Dutch CDL (ccvB) & HAZMAT (ADR)
How to start?
I will be in the USA from 22th may till 22 june.
English language overall GOOD
I know this is short day, but I just made arrangements for this trip to happen a few days ago.

Answer:
Check out www.truckersforusa.com
Do you have a valid legal work visa?

Answer:

I take it you'll be in country a month?
I doubt you'll find any one to hire you for such a short period, unless it was under the table.
By the time a company goes thru all the legal mumbo jumbo to check your background/work history most of the month will be gone.

Answer:
I will be on holliday to check things out.
See how they work and get some information.
So I do not yet have a workingpermit, but I do have relatives allready living in the USA.
That month will be holliday and checking things out. 'Look before you leap' ... kin'da thing!