Question

why are there four rear wheels in truck and two wheels in front​

Answer 1

Explanation:

For the last 100 years, dual tires have been used on the non-steering axles of heavy-duty commercial trucks to increase their load capacity and help maintain vehicle drivability in the event of a flat rear tire. ... All of their wheels feature extreme offsets to allow them to be installed center-to-center on the rear axle.......

Answer 2

EXPLAIN : Because the heave weight at the back and less weight at front