OK so from the other side:
Caravans/Motorhomes are good if you are going to use them regularly. When the kids were little we had trailer tents, went away 2 weekends a month, back then it was £6-8 a night to go to a haven site, camp and use all there facilities. Brilliant. We upgraded to a caravan and I hated it. More room, and everything was neater but the roof was very noisy when it rained and towing it was harder as it was bigger, heavier etc. Got rid of it after a couple of years.
Motorhomes - I drove a motorhome regularly as we had one for a paddock home when I engineered for a privateer racing a caterham. Cosy but worked ok, slow to go anywhere, we travelled everywhere at 50mph, towing a car on a trailer. Some of the others had large motorhomes, but then size becomes an issue in places. I know a couple of people who have bought them, nice vehicles but not really used then sold on.
Those with them - do you find you have to look at routes? I know of roads around Cornwall, Pembrokeshire etc that would be wholey unsuitable to anything bigger than a family car. We thought about looking again at them for holidays with the dog, but it just wasn't cost effective. There's plenty of small cottages you can hire cheaply everywhere.