crawl under the RV and look at the tag that should be on one of those Axles..Dexter most likely..
Should be 7K axles... since its a 2019 the wheel bearings and races shouldn't be needing replaced if they have been properly taken care of...
The 10-36 DL seal is available at many on line sights and sone auto ports store... Make sure its double lipped.
This service manual will help you with the sizes of parts, the proper procedure for the initial wheel bearing torque and backing the nut off and finger tighten only
https://www.dexteraxle.com/user_area...ice_manual.pdf
If you use the 10-36 DL grease seals I have used these for the last several years.. never an issue
https://www.amazon.com/WPS-Trailer-G...62821593&psc=1
And don't let someone tell you that Timken is the best.. they aren't...
The OEM Dexter wheel bearings and races are very good