The Swedish Strv 103, commonly known as the "S-Tank", was an odd-looking, but effective design. The 105mm gun was fixed, aimed by moving the entire vehicle.
Image credit: Jorchr, via Wikimedia Commons [CC BY-SA]
In the late 1970s, Czechoslovakia began development of a wheeled 152mm self-propelled gun-howitzer. The result was the vzor 77 Dana, which entered service with the Czech army in 1981. It had an eight-wheeled chassis based on components of the Tatra 813 8x8 lorry, rather than the more usual tracked chassis.