I have just done similar with my diaries Davy. 19 nights away but we have had other considerations apart from Covid which prevented us getting away. I checked my diesel and gas usage. I only needed one fill up of diesel (I keep the tank full all winter). As for gas, I only had one refill of LPG but I did run a couple of standard bottles empty so I could get full ones in their place for Winter touring (that was a bit optimistic with hindsight ).