I need four new or very good condition 15" trailer tires. I either have to replace my 6 lug wheels or have em stripped and powder coated. They're the white wagon wheel type. Any suggestions appreciated.

Try: www.emptrailerparts.com
You won't find better service or prices.
I just bought 4 new wheel/tire combinations, Carlisle trailer tires 225/75-15 on galvanized spoke rims, $88 each plus $19 shipping to my house. I had them in four days.