Travelling to Tunisia with load over Brexit decision Time

I am working my way through the paperwork for the above trip and am coming across various references for Attestation Documents. I dont work as a truck driver for a living so I tend to have a variety of gaps on my tacho cards as sometimes the truck isn’t driven for weeks because I am doing other things. I depart for the above job on the 19th Jan but prior to this the truck will have only been driven by me 3 times probably and all of those really short trips so the previous 28 days shows quite a few gaps.
Is this document still required and if so where do I get a copy of one that I can use as a template that will take a variety of dates and activities that are not to do with driving the truck? Given the fines levied I want to make sure I cover all bases on this if I can. Many thanks for your thoughts…