Concrete – Need to move concrete slabs to backyard

I am building a pizza oven for the backyard and part of the build instructions said to build three concrete slabs (2 that are 47" x 20" x 5.5" and another that is 47" x 29.5" x 5.5"). It asks you to pour the slabs on a flat surface like a garage floor.

I poured them on my garage floors without thinking how the heck I was going to get them to the back yard and up on top of the CMU base that is 5 courses high (so a little over 42 inches high). I have to get them through a fence gate (when removed it leaves a 33" wide clearance side to side.

I was thinking an engine hoist would be great but the orientation of the legs I think would be too wide to get through the gate fence. My next idea was to construct an A frame to lift it onto a sled to transport it to the back and then use the A frame equipped with a chain fall to bring it higher.

What do you guys think about that approach or do you have another?

I believe the two smaller slabs to be about 450lbs each and the bigger slab to be close to 800lbs.