The Swedish Landsverk L-30 Light Tank  was a proposed tank design that offered the advantages for long distance road driving that wheeled vehicles offered and could switch to tracks giving better off-road mobility with in 39 seconds.  First seen in 1931, the vehicle failed to be ordered by the Swedish Army, nor attract any exports.

The Swedish Landsverk L-30 Light Tank Spec’s

Crew: 3
Armament: x1 37mm main gun and x1 7.92mm MG
Armour: 14mm (max)
Weight: 11.5 tonne
Top Road Speed: Unknown
Operational Range: Unknown
Dimensions: Length 5.18m / Width 2.44m / Height 2.23m
Engine: Maybach V12 150bhp