The most reliable motorhome is one that will give you many years of trouble-free touring. This means that the base vehicle needs to perform and the interior fit needs to withstand years of use. Most premium motorhomes built on a European base vehicle such as Fiat or Mercedes Benz will still perform well after plenty of years and many miles. Unlike a lot of cars, these truck bases are designed to go the distance even with several hundred thousand kilometres on the clock.
The reliability of the motorhome fitout is dependent on the quality of the build. This includes materials, construction methods, and quality assurance processes. German motorhome brands have built their reputations on quality. For example, Carado motorhomes are designed with a high price to value ratio meaning that quality is not sacrificed even though they're designed for a price conscious market.
Many locally manufactured motorhomes that are hand-built to high quality standards will also stand the test of time. The best way to get a quick indication of reliability is to check the warranties that a manufacturer offers. Longer warranties indicate that the manufacturer has a high degree of confidence in the reliability of its products.