Before you consider re tapping the threads re check to make sure you have the right sized anode rod.
Rv water heater anode thread size.
The thread size in these water heaters for the anode is 3 4 inch npt which is a tapered pipe thread.
I reached out to my contact at suburban and they advised me that your water heater has a 3 4 npt national pipe threading and it has 12 threads inch.
You ll need a 3 4 inch npt thread chaser since the replacement anode will likely have a tapered pipe thread.
Ozek rv water heater magnesium anode rod with ptfe tape compatible with suburban and mor flo water heater tanks 9 25 length npt threads 2 pack 4 8 out of 5 stars 853 11 99.
Plumbonline have put together a comparison table see below to make selecting your anode as simple as possible as in most cases the owner manual for your hot water service does not detail the size.