Caravan! If you spent £6000 to get a descent caravan you could go and stay in a £60 b+b 100 times instead. That's two weeks a year for 7 years and doesn't include caravan insurance, maintenance, etc etc........
No towing. Warm bed. Hot showers. Someone else cooks the full English in the morning.....
Try 5 people high summer and see how much accomodation costs