I love camping (and I'm a woman), but I see your wife's point. Years ago, we used to camp regularly with 2 adults and 5 children.
Although I was always happy to go, the jobs of packing/unpacking clothes and food for 7 people always seemed to end up with me. I also did all the tidying up around the campsite - or nagged the kids to do it and also did most of the cooking.
The older kids were supposed to do the washing up, but apprently they were on holidays, so didn't feel the need to do it straight after a meal, hence leaving dirty dishes around. Not much support from their father either.
As you can imagine, this gets pretty tiresome for a mother and frustrating.
Maybe if you and the kids took over certain chores (and actually did them at the right times), your wife might be able to relax and have a holiday too. Too many times, I see people just having to do the same stuff, just in a smaller (albeit nicer) place.
Sorry if this sounds like a rant.
New relationship now, youngest kid is 20, and we have a full size caravan. I still cook, but partner does all the washing up - straight away. Happy :-)