Hi Garry; do some measurements on your current tire setup, space between the wheels, and space between tire and bottom of trailer. The section width of the 225 increases the 205 by ~.6 inches which makes the tire ~1.2 inches greater in diameter. That being stated, I used g/year marathons for years and had many blowouts. A few years ago, on advice from a friend, I had them replaced with Continentals and have had no problems. The marathons were almost new when one blew out. I sold the remaining 3 at a yard sale.