With rugged tread pattern and bold sidewall lettering, an all-terrain (A/T) tyre is a hench addition to any 4×4 or pick-up. They’re also an increasingly popular option for campervans. But does true off-road muscle lurk behind this aggressive appearance? To answer this question, specialist motorhome publication Promobil put seven size 255/55 R18 tyres A/T tyres to the test.