Mahindra is readying a longer five-door derivative of the Thar in a bid to target a larger set of buyers. The 5-door variant is expected to be a hard-top only with the biggest change compared to the current model being the extended wheelbase and the presence of two additional doors. Images of testmules suggest a design that sees little change from the 3-Door Thar. Inside the cabin too is set to remain unchanged with the 5-Door getting a…