Newbie need advice

Hey guys, newbie is here!

My name is Matthew, you can call me just Matt I've been lurking this forum for a while and decided to register, say 'Hello' and possibly get a good advice! Finally I have found the time to do a coast to coast road trip and almost have everything to make this long-term dream come true. The last thing I need before hitting the road, is a good tent to sleep in. I've heard that there are such tents for truck, which could be installed on the beds. Has anyone tried them or do you guys have any feedback?