Huh it's not that easy.
First of all you must starting with your van's battery if you are using the van's battery and it's small you are f.ukkd ( other things are: plain lead battery, start-stop system...etc) if you are using separeted battery you will problems the charging and the balancing current between the batterys (except if you are using separted generators)
Second you will need the sum the comsumption and at least using a 1.5 multiplier (ex: 700w total you'll need 1050w or 1000) not peak! Countinous
Third you have to choose the modified sinus or a real sinus converter. Modified is cheap and suxx if you are dealing with motors or transformators (like drill ..etc bcose it's simply not working)
Fourth Don't choose a cheap one! You will regret if it's killing something valuable
If you are dealing only with switching supplys like notebook chargers and you have plain lead battery in the van (for the starter ) the best and cheapest option is an APC battery backup. Smth like this It's great quality and cheap. Take out the battery pack and connect your van's battery.
If you want a full solution my favorit is an solar cell converter. Pricey as hell and if it's not chinese crap it will lasts for the end of their capacitors it's coming with real sinus and with great battery manegement system.
edit:
look around on campers forums too. They are dealing with this since the beginning
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