My 2014 Reata came with Vault hubs, not oil bath. Yours likely are as well.
Vault hubs are similar to oil bath but they use a hybrid grease that liquefies when they warm up so acts like oil when towing. Unlike oil bath hubs there is no way to change the oil/grease without taking them apart.
Mine are still all original and have not had any issues. But I’ll probably redo them next spring because it seems like it’s time.
https://pacifictrailers.com/blogs/boat-trailer-tips-advice/the-vault-hybrid-lubrication-system