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USA T131 280mm Heavy Motorized Gun
This is the experimental model of the M65 atomic cannon. Adopted in 1956, the cannon could fire both nuclear and conventional shells up to 18 miles. The cannon weighs 47 tons and is mobile. The prime mover consists of both a front and a rear truck that can reach a maximum speed of 30 mph. The atomic cannon was replaced by more mobile rockets in the mid 1960s.
The warheads were 20 kilotons, which had a blast radius of about a mile. Given the 18 mile range of the cannon, this was considered safe enough.
The M31 Honest John missiles (like the one pictured) that replaced these cannons actually had a slightly lesser range of 15 miles (24km). The improved M50 Honest Johns eventually introduced in the 1970s had 30 mile (48 km) range.
These were meant for tactical employment, rather than strategic like ICBMs.