With a three axle trailer and today’s improved tires, I’d probably stay with 16’s (depending upon the trailers weight). Concerning the subject of tires/rims, it’s pretty difficult to have “too much”! We’re running J-rated 17.5’s.....and wouldn’t consider going back to 16’s. With the poor roads, potential road hazards, and occasional (off pavement travel) on our menue.....it’s “piece of mind”!
Similar can be said for truck tires. Many HD pick-up trucks have axle ratings far exceeding the tire/rim ratings. For some folks a dually is “not” a practical application for their lifestyle. For our SRW, we upgraded to 19.5” Steel wheels (5000 lb. rating), with H rated tires 4900+ lbs. rating at full pressure). So far....this is an improvement that has worked very well. Again....”Piece of mind”!
