Welcome to the forum.
Buy a Roadside Assistance policy. The most popular are
Good Sam and
Coach-Net.
They will send someone to change the tire for you.
Also, check your RV insurance policy, maybe you are covered.
To answer your question a bottle jack would be easier/smaller to carry. But a floor jack would probably be easier to use. Your call. :)
And, check the age of your tires. RV tires usually age out before they wear out. Most replace the tires at 6-9 years.
Monitor your tire pressure, that's important.
Don't hesitate to ask questions on the forum. Someone will have the answer.
Enjoy your travels.