I have a triple axle pontoon trailer with 5.30-12 LRC tires that are dry rot. Checking some tire stores and looking on-line, I can buy six tires with wheels for less that buying the tires only and having them mounted. I'm a couple blocks from the water and only put on about 15 miles a year so not too concerned about the tire quality (Greenball or Carlyle). I'm wondering about wheel quality. If I buy the tire/rim combo are the new wheels the same as the ones with the original tires? Or should I buy tires and have them mounted on the original rims. -Thanks-