But that’s still impractical, you can only put your tools in there temporarily, but you can’t leave them unattended in an open truck bed or they would get stolen. Over here carpenters, masons, electricians and people in similar occupations usually use vans. Often they have shelves and other storage solutions in their van for their tools. Here are some examples (text is in Dutch but the photos are self explanatory).
You can still use a trailer with a van, and they often have roof-racks for things like long pieces of lumber, a ladder, etc. In comparison a truck just seems way less practical than a van.