They moved for the usual reasons. Much better salaries, cheaper living and an area whose crime rate is the lowest in the USA. Health care covered by their employers and a most useful local delivery service.
The £2200 is the cost to them of this van....not a hire cost, that got ridiculous when they went to the usual RV. hire dealers with everything except the body seeming to be a chargeable extra - the Chevy seemed more sensible.
After all, when they lived with us over here, we had 3 Z28 Camaros between us, so she is used to driving fairly large vehicles