How do y’all travel long distance?

I have a 6 year old basset and an 8 week old I just got today. I have a Silverado that my 6 year old rides in the bed of around town but never gone farther than 20 minutes. This summer I’m hoping to take them down to Florida (7 hour drive) for a couple weeks. How do yall travel long distance? I guess kennels in the bed? Surely I couldn’t let them loose back there for that long of a ride and even if there bodies aloud them to fit in the backseat I got two human kids back there lol thanks for the tips