When I bought my current 5th wheel last year (new), I upgraded the tires to LTs as part of the deal. There was no way I was going to accept the crappy junk factory installed tires.
Steve Rinker Rochester, NY 2013 Keystone Sydney 340FBH 5th Wheel, 12,280 lbs loaded (scale) 2015.5 GMC Sierra Denali 3500, SRW, Duramax, CC, Payload 3,700 (sticker- not scaled yet)
Take my posts for what they are, opinions based on my own experiences.