Obviously, this is possible physically. But I'm pretty sure it's against the law, and I'd definitely advise against it. If it is a very short ride through your town to get somewhere, then I'd say you can try. But DO NOT go on the highway in the bed of a pickup truck. It's super dangerous. I used to carpool to soccer camp with my team and sometimes we would ride in the bed of a pickup truck. The cops yelled at us and we were only going .5 miles from where we were. Just make the right choice and be prepared to have consequences. Hope this helps!!!