The space in your pest control vehicle was expensive. You had to buy an entire truck to haul your pest control equipment around so you could do your job, make money, feed your family. If your truck cost you $30,000 and your bed is 6' long, you paid $5000 per linear foot for that bed!!!!
When something is expensive, it makes sense to use it wisely. When a client comes into our pest control equipment shop and wants a custom spray rig, we take the time to plan the rig, and we put the components in the vehicle to see how everything will fit and so the client can see what it will be like to use the truck every day.
It is not a perfect science. Truck beds are not specifically designed for pest control sprayers. There are constraints that sometimes prevent you from putting stuff where you want to put it. For example, gas tank, structural members, etc.
In any case, we do the best we can to make the best use of the client's bed space. That's why when this vehicle came in, I had to have a photo.
The client did the install himself, obviously. He set the toolbox back 4 or 5 inches from the front of the bed. This is wasted space. Client need to leave a little room for clearance but this is crazy. My experience is that pest control professionals are always looking to add a new piece of pest equipment or tool to their arsenal. I guarantee at some point in the future he is going to wish he had that space back.
Measure twice. Cut once. Ask for help.