Most garages listed as 1.5 cars (and even 2.5 cars) garage sizes are not accurate. The half side mostly is only a 6ft wide door, and around half of the depth of a normal space. More like 1/3 of a space, not an extra 1/2.
OP is asking to put 1 car, plus the equivalent of another car (2 carts) into less space than they would occupy.
The only possible exception is if the floor plans were stretched, and somehow things were enlarged substantially. Doubt they would still call it a 1.5 car space.
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