My little one is very rambunctious

I'm more concerned about what type of travel gear I should purchase, should I buy a new car seat thats small enough to check-in for our rental car or just use a booster seat? and should we bother with a stroller.
Any tips, advice will HELP so much! Thanks!
Re: plane ride with a 2 1/2 year old, help?
He's many many years from a booster. Most kids aren't booster ready until 6-7ish.
If you want buy a less expensive seat for the flight and trip and he isn't above the height limit I've seen CPSTs recommend the Serena for travel.
Good luck!