Why Gun Tractor Shape

[Niels V]

I stumbled across this statement today will discussing Morris FAT designs:” while early Quads had the distinctive "beetle-back" shape, from 1944, the final model, the Mark 5, moved away from this characteristic shape as it was realised that it was too readily recognisable from the air, and therefore instantly indicated the position of an artillery unit. The Mark 5 was therefore given a more square body with a canvas-covered cargo space at the rear which made the vehicle resemble an ordinary cargo truck.”
From https://m.ww2db.com/vehicle_spec.php?q=O515 ,
Has anyone heard of this before