Thanks guys!
I took my first one camping heaps when he was a baby...but that was just one.
The plan is to take a couple of 4WDs with at least a camper trailer on any big trips in the future. Plenty of storage that way, and impossible to fit everyone and everything into one vehicle.
Everyone keeps telling me to make a show called 'Touring with Triplets'.
I think those that don't require the third row seating in a 4wd don't really appreciate the space struggles of big families. Not only do you lose most of the space in the vehicle, just taking enough bedding to keep everyone warm etc takes up multiples of the space it does for couples.
My advice would be either a step through soft floor if you want a camper or as you say a toy hauler if you want a van.
If grandparents are into camping as well, then many hands make light work, and with triplets, you could do with all the help you can get.
I personally find non-touring camping a bit more enjoyable too, otherwise it's a lot of effort setting up and packing down for that many.