We chose a Class A because we tow a ski boat in the summer and dirt bikes in the spring and fall.
It can be done with a truck and trailer, but here in California, we are limited to 65 total feet. So that means a short Fifth wheel to accommodate the boat and dirt bikes.
Class A has
More storage
Able to bake dinner in oven while traveling
Able to use the bathroom while traveling
Make and eat lunch while traveling
Easier to load and go than trailer, IMHO
For us, the cost of our Class A was about $30,000 less than a truck and trailer of same size and amenities. We already had a tow vehicle.
If you find an RV that has been well taken care of, ownership is not that expensive. Yes, fixing things can get expensive but all of the expensive items in a class a are also in a trailer, I.e. Refer, stove, holding tanks, etc.
Chassis repairs are the difference.
Good luck and have fun. Memories made on the road cannot be repeated at your typical home.