There are no issues with this at all as long as you are insured and the person who owns/farms the land has granted permission.
I frequently put the T-Craft into stubble fields when combines are rolling and have been known to deliver fish and chips and (weak) lager to the drivers on long summer evenings.
Only do it in a suitable type and by that I mean something that was designed to take the punishment that some fields offer at 45 mph.