Tramping... what to expect

To save money on marked up motorway services tea and coffee , a Thermos will suffice , some truck stops charge 50 pence to fill it with hot water.
If you are cooking in the cab , a basic gas cooker.
Aldi or Lidl have decent canned food and soups.

Get your boss to have a SNAP account for overnight parking and truck washing.
You just sign in on arrival , give the registration , job done.
To add camping shops for your cooker.

A TV at night makes tramping home from home.
Stuff like shavers and toothpaste / brushes , have double of all that kit , to leave it all in the cab when you go home , to save carting back and forth the car and lorry.

Foam ear plugs for a noisy layby .
Tupperware boxes for all the bits and bobs.
A large sports bag to haul the bedding for washing at home .
A duvet or sleeping bag , bed sheets to cover the bunk.