I sered with HJ & our lifespan if the Russians came was not expected to be long as Speznaz had nuclear artillery as a prime target. We adopted "scoot & shoot" to have minimum exposure, otherwise we hid! The 8" was smaller & easier to hide & came into action relatively quickly. Its advantage as a weapon was that its accuracy (compared to HJ) was excellent, so it was to be used against relatively small pinpoint targets,,,evena quarter kt would give a serious headache!
The shell only weighed about 100kg, so could be (and was) carried in the back of a Landrover! But don't tell the Americans who required there prcious warheads to be escorted by armoured cars, platoons of infantry all covered in warning flags!
D