Hi Crypto mine is only wired for lights only, i dont charge the battery or run the fridge from the car, to be fair i always go electric hookup and never run the fridge whilst traveling.
Been there too Bessie. After three years or 60000 miles, back it goes.
Fortunately my company came up with another option where I was able to fund the car myself and was given a monthly allowance to fund the purchase and running costs. In itself it didn't save much money but was more tax efficient and also gave me the ability to choose my own car instead of a black mondeo