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These are trailers that can be hooked on any car with a hitch and moved to a location. Roadtax and insurance is low.
As with a high van you need standing height for a makerspace, so a at least 2m10.
For a mobile fablab you want space, so look for a trailer with its wheels inboard.
Forget about a used horse trailer for a mobile fablab. It is built for carrying weight. And for a makerspace you do not need a double axle.

A commercial vending trailer with wheels inboard makes a good fablab. Its opening wall panel will prove an asset if you extend the lab outside.
As most of the interior will be fixed a single door in the end is enough, a rear door that folds down to a ramp is not really necessary.

An beautiful example is the mexican Makerbus.
Despite its name it is a high trailer.

Note how simple its immense space is supported and leveled.
Just standard struts, there is also no need for fancy hydraulic ones.

If the climate is good, think about serving from the inside, with fabbers on the outside on retractable platforms.

 

When you design the interior, stage a making session with lots of cardboard boxes to simulate operation. Ask a few kids to help.
This will learn about working height, storage, where to put lights and outlets. And where to put and secure the equipment.
You might even decide to put the lasercutters’ exhaust through the floor. And do not worry: glass tube laser cutters are very robust and can be shuttled around.

For the rest the same principles apply as for makerspaces in trucks and busses: workbench width, stools, lighting, solar panels, etc

A trailer can also be fitted as a classroom. A transparant roof is fine when the weather is not. But not when the weather is hot. Think about a big outside awning. The outdoors can be a free extension to the lab. Have folding picnic tables.