Reached Rawalpindi safely at 6pm on 30 May. Car performed well throughout despite extreme temperatures in Sindh and lower Punjab. Only faced one strange problem of A/C blower after Multan. It blew out air at very low speeds leading to warm cabin. A/C was chilling but blower was too slow. Today it was working just fine. I think using it continuously for many hours probably caused the blower motor to heat up and reduce it's speed. Otherwise the car drive well with two adults, two children and trunk fully loaded at speeds up to 140km/h on Motorways.
I would recommend this trip to anyone but only in winter. Summer is too harsh for car and occupants.