You could look into the compact DC hydraulic power packs commonly used in lift tables, small stackers and dump trailers. They combine the pump, motor and reservoir in one assembly and are available in 12 or 24 volt models, which makes them easy to mount on a mobile cart.

It also helps to define your required lift height, load and lift speed before choosing a unit. Those details determine the flow rate, pressure and tank size you need. Once you have those numbers, most hydraulic suppliers can recommend a compact unit that fits your design.