Just get a full set of tires. When I bought my old motorhome it had a set of no-name Chinese tires on it. Of course I had a massive blowout on a 10 lane section of highway in the evening rush hour. I literally thought my wife had a heart attack. It cost me $2700.00 bucks for a brand new set of tires that evening but, I was happy to pay it. What seems expensive now seems cheap when bad things happen.
My point is get a set of tires, all the same, equal to the task, and of good reputation. Never skimp on tires related to RV-ing.