If you come to Thailand for a holiday, it’s your only sensible option for going around by motorhome.
If Thailand is your preferred country to live in, but visa restrictions allow you but a few months per year, renting on a monthly basis still is clearly more economical than any other option you could think of.
And if indeed, Thailand is your country of residence, your are still a long way from car ownership in your name. Buying a car in the name of a Thai girlfriend or wife isn’t a smart consideration, as many a Farang can attest who ended up without car and without wife.
Any way you turn it, a least vehicle that is not under the control of a female Thai partner is a smarter solution.