Material handling in a really small shop

I’m just getting started doing real fabrication work and I need to get my material handling under control. My shop is one and a half garage bays in a three car garage (USA, so roughly 15’ x 20’ with a big post unfortunately right in the middle of it), and everything except the plasma table is on casters so I can move it around. I have been buying my sheet and plate steel in 24” x 48” segments because that’s basically the biggest thing I can wrangle by hand, and even then 1/4” steel is the absolute max and a real struggle. I have projects coming up where I’ll need to handle 48” x 48” sheets of 3/16” and those are 122 lbs, I can’t do that by hand.

The best thing I have right now is a mini skid steer with pallet fork attachment that I can get material out of my truck with, but it’s too big to drive into the shop and do fine maneuvering. For those of you who move steel in a tiny shop, what are your go-to tools and methods? I’m willing to spend real money on good tools to save my back.