First off, THANK YOU for your service to our nation! And, glad you made it home!
Is this a brand new coach you are getting? If so,(even if it isn't) for sure get them to throw in a starter kit as mentioned. With all the electronics in the new coaches, get a surge/ polarity protector. (when budget allows) This one on Ebay is 10 bucks cheaper than Amazon.
https://www.ebay.com/itm/Progressive...75.c1#viTabs_0
https://www.ebay.com/itm/Valterra-RV...0cZe:rk:1:pf:0