OrlandoFeller,
You're getting some good suggestions, but good suggestions also need to match what you're driving.
What are you putting your box on? Flatbed, regular bed pickup, shortbed, extended cab, 1/2, 3/4, 1-ton? Do you have onboard hydraulics? Do you JUST want a box? How will the chips be unloaded? And very importantly, where will your tools be stowed and secured and maintained?
What size chipper are you pullin?
You really want to make a good decision, rather than a decision. Whatever you get will cost you some money, but how well it allows you to make money and stay up and running on into the future is the bigger question. Is it a system you can grow into or is is barely better than what you had? How well does the rig allow you to stay organized and do self-maintenance in the field.
Taking on chips or wood should be the default, a given. What all do you want out of the rig, ideally? A box to take chips is easy, a no-brainer, dozens of different ways to achieve that basic goal. What MORE do you want out of the system? Share it, brother.