I used an 8' x 5' ( or maybe 10' x 5') tandem hire trailer to take my moke to the muster last year
I had to tie both tailgates up against the tyres as the axle centres where only about 2" inside the trailer, the side to side clearance was only about 2" also so it was a very tight fit all round.
A moke only weighs about 540kg so I think you could get away with a single axle trailer with some light truck tyres, for peace of mind a tandem is best.