A few years ago my wife and I met a British couple who owned a fifthwheel and truck to pull it here in the US. They spend the maximum time allowed (6 months?) traveling the US before heading back across the pond to the UK. There they spend the minimum required time before coming back to the US. They've been doing it for years.
IIRC, they have to spend a certain number of days in the UK to keep their medical insurance coverage.