Personally, fixed chains to front of trailer to connect to towing eye/U/C of machine. Track rearwards until tight.
Then a fixed chain and Binder to secure it backwards.
Some utter prick will be along to say that it's not safe/correct/compliant having only one chain and binder, reality is it's about as safe as your going to get a mini digger on a trailer, and that is all that matters.... compliance is in the eyes of the beholder.
I've got to weld some now lashings to the lorry now I know how the machine sits best, and this is what I will be doing with 2x chains to the U/C towing Eye - Front headboard and then two binders from the blade to the lorry deck.
The 1.9t diggers tend to get a 10t strap over the Blade or Kingpost and a 10t strap from towing point to the back of the trailer.