The most stable conformation of trans-1-tert-butyl-2-methylcyclohexane is the one in which:

The most stable conformation of trans-1-tert-butyl-2-methylcyclohexane is the one in which both the tert-butyl group and the methyl group are located near the equatorial position. Trans conformation are usually stable at the equatorial position to avoid the bulkyl group (the tert-butyl group and methyl group) be together to reduce the so called Steric hindrance.