When you set out on your holiday there are things that you must put in place. These are divided into at home and on the trip.
Are you going to lock up and go or are you going to have somebody house sit?
Lock up and go: have you arranged for someone to collect the mail, water the garden, put the bins out so that it looks like someone is at home, if you have security let them know of your absence dates.
Good medical kit
Make sure you have prescriptions made up to cover the time you are away
Good supply of water for you and the vehicle. Water for each person to cover 7 days in case of breakdown
Food to for each person to cover 7 days in case of breakdown
Food that doesn't need to be refrigerated
Twoway radio with aerial strong enough to reach hill tops
At least two spear wheels and rims
Pump that can inflate tyes independently