The OEM trailer wheels have a load rating of 2600 #'s. Your replacement should be there too.
Wheels do not go bad from age. They only go bad if physically damaged or if they sustain rust damage. In those cases further damage the wheels so they can not be used and pitch them.
Good luck onn your search.
1966 Mercury Park Lane 4 DR Breezeway 410 4V, C-6, 2.80 - Streamless.
1966 Lincoln 4 door Convertible 462 4V 1971 Ford LTD Convertible 429 4V Phoenix ~ Yeah it's hot however it's a dry heat!