Your water heater (Atwood) has an aluminium tank and does not require an anode rod. The plastic plug is the correct fitting. Using a metal plug would cause contact between dissimilar metals which would start corrosion.
If it has been open for a while, grab an RV water heater flush wand from Amazon or in the RV section in Wally World. It attaches to the end of a garden hose and inserts through the drain plug opening and will give the tank a powerful flush.
ETA: forgot to say, Welcome to JOF! Lots of friendly knowledgeable people here.
Do you have the manual for your HTT? Check the manuals section here on JOF to see if yours is posted if you don't. They are pretty generic (cover an entire model line) but will explain most of the basics you need. Manuals are also available on the Jayco site for most recent years.
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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