Sure. Let's investigate the only electric pickup that can tow 3.4 Tonn.
The gigantic Ford F150 lightning,base price about £50K,so you would have to import it,convert it to right hand drive. Back of fag packet breakdown below.
Base Vehicle £50k
Domestic transport to port £3k
Shipping to Scotland £2.5k
Shipping inside the UK £1500
Vat,import and handling fees £11,000
Conversation to rh drive £10,000 easy
£78,000 now it's on the road,so now it will have about 1/3 the range of a Diesel when towing. Sadly there is a lack of charging facilities pretty much anywhere off the main routes anywhere I know. So let's buy a nice big 10kva generator to sit on the deck.
£3000
This can run all day as Dave is milling,providing of course he gets to the job on a single charge. But and it is a big but,the short charging frequency will rinse his battery. Sadly the batt packs in pretty much any electric vehicle are non replaceable ,so be prepared to scrap the truck in four years in order to buy another.
His clients won't buy his services any longer,and since of course every Miller in Scotland bought and electric wagon thus charging a fortune. The timber now goes to firewood and the dimensional Oak gets imported from the Baltics where they don't give a toss about HSE or emissions. Perfect!