改进题：Both heavy-duty trucks and platform trucks enquired for in your Fax under reply are not available for supply.

译文：贵方传真所询载重汽车和平板车都无货可供。

改进题：Both heavy-duty trucks and platform trucks enquired for in your Fax under reply are not available for supply.

译文：贵方传真所询载重汽车和平板车都无货可供。

改进的译文：贵方传真所询载重汽车和平板车只有一种有货。