Ghost are very good.
Dependent upon value, you’ll need to consider having a tracker installed as well, a lot of insurance companies insist on them. A lifetime package can work out much cheaper.
Also..
Consider visible security.
A thief will peel /hole a door before finding it won’t start. An immobiliser and tracker won’t do anything to prevent a break in, esp as anyone seeing you park up would hope for cash/cards and passports to be kept inside.
If you tend to leave your van parked up in a secluded car park whilst you wander off for a hike, you might want to consider fitting deadlocks to deter a break in and all the damage that entails whether or not there is anything in it to steal, they won’t know that. Anyone seeing you walk away will think that they have plenty of time.
Sorry to be so negative, but it’s taken me a while and plenty of ££s to feel comfortable.
I speak from experience, 32yrs police and 15 yrs relevant roles beyond that.