We love our motorhome but do find it quite expensive (fuel, insurance, regular service, winter storage - it really pays off to keep it in a heated garage during the winter etc.).
We found that we couldn't leave stuff like towels/bedding/clothes in when not in use as it becomes a little too damp and smelly.
We love to have our own toilet and shower. If the camping is nice and clean we use the shower there but especially for the kids often use the shower in the camper.
We have a small portable oven which we store away when not in use but still enables us to make pizzas etc. when we want. Also, we had a brilliant fully automatic satellite system installed, which is worth every penny.
If you decide to buy a camper I would like to recommend installing a smoke alarm and even more important, a carbon monoxide alarm given that the heating, water heating, fridge and cooker all use gas (except when hooked up), also invest in levelling blocks if they don't come with the camper.
We leave kitchen stuff (including foodstuffs which do not need cooling), toys, tools (including food grade hose, levelling blocks, plastic boards for when you are stuck in the mud, buckets, cleaners etc. etc.) in the camper. This enables us to pack in about 1 hour and be on the road.
I think that especially with young kids it is nice as you can take more of their stuff with you and if the weather is bad you can still have a great time together.