Get an RV wheel. Acquire it new from a RV dealer, or used from a RV salvage yard. There is a salvage yard here in Phoenix and several across the country. I am just not familar with the Northeast. - Note the bolt pattern will likely match to an automotive axle, however an automotive wheel is too weak.
Match the spare tire with the rating* for the rest of your tires. Do not skimp on tire or wheel. (It messes up a good vacation.) Then have it all balanced.
* The rating on the tire side wall is for max inflation. If you add the rating for all of the tires on the ground, it should be greater than the total fully loaded weight of the trailer. If not than new tires are needed.
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!