as per the latest issue on the DSA exam book the vehicle must be road registered so no tipping up with a mini excavator. i would suggest that you do fit lights and indicators even if they are magnetic ones ala carrier Barry. after all it is merely a simple switch and a relay. a couple of light boards stripped down then linked up to a small switch panel
or as Ron says in the case of a carrier (which was not fitted with said lights at the time of manufacture use hand signals) but i must stress it will make it much harder for you.
my advice would be to do it in a CVRT if you can, excellent vision and great control surfaces. carriers are very hard for reverse or view from behind...so you would need to fit a load of mirrors on her matey.