Based on this product's specifications, here are some alternatives and similar models
Wheel tire 5.00x6 for TC1840, AWTools, model AW00013
Summary description:
Replacement wheel tire sized 5.00x6 designed for TC1840 equipment. Manufactured by AWTools (model AW00013), this spare tire fits compatible small machinery or trolley applications that use a 5.00x6 wheel assembly. Suitable for maintenance and repair tasks where a direct-fit pneumatic wheel is required to restore mobility and load-bearing capability.