Per Marlin City Ordinance 6-1008,
In any of the residential districts, no parking space, garage or carport or other vehicle storage space or structure shall be used for the storage of any truck, truck trailer or van, except panel and pick-up trucks not exceeding one and one-half (1 1/2) ton capacity.
Meaning that 18-wheelers are not allowed to be parked in any residential area and are subject to be cited and/or towed.