In message , Roger
writes
The message
from The Natural Philosopher contains these words:

They aren't designed to tavel. They are designed to dig, oddly enough.

Hence the query about needing to budget for a trailer as well. I could
use my neighbours tractor to tow it around.

How about an old caravan chassis? Old caravans are fairly often
available via Freecyclye.

My own trailer is a basic caravan chassis, comprising the original angle
iron (?) frame, with boards (the original caravan floor) on top. The
load bed is 10' 8" by 6' 4", although I have no idea which type of
caravan it came from, as I didn't complete the conversion myself.
Conversion is too strong a word - it is really just whatever was left
when everything above floor level was ripped off.

Mine managed 500 miles from Aberdeenshire to Hertfordshire, then back
again with a Morris Minor on board, without any problems. Just needed a
light board, which was screwed to the rear. I did arrive home minus one
mudguard, though :-)

I would think something similar would be ideal for towing a mini digger
across a field with a tractor, perhaps running the trailer wheels on
lower than normal tyre pressure.
--
Graeme