Ron,My 2 centsYou are doing this forum a dis-service by advocating that people overload their PC.Putting higher load rated tires on does NOT increase the load capacity of the vehicle, individual axles, springs, shocks, sway bars, rims, etc. The fact that you have "heard" Ford under rates their axles is no better than you had a dream about it. I am fine with heavier load capacity tires for added safety as long as you keep within cold pressure limits for the tires AND rims and keep axle and vehicle loads within their rated limits. I say the above as a retired 26 year veteran police officer from a major city whose first 13 years were spent as an expert in vehicle serious injury and fatality investigations and accident reconstruction.
Hi catsaplenty,I am not sure if you read my recent post on higher rated tires for the heaviest of PCs. CLICK HERE to read through it.If I owned an extra heavy PC 2910 or 3100 with 2 or 3 slide-outs, I would immediately replace the tires with those that are rated 500 pounds more. That increases your tire load carrying capability by 2000 pounds in back, and 1000 pounds in front. People have experienced tire blow-outs with their extra heavy 2910 and 3100 PCs. Not just the loss of the tire, but the explosion shreds the tire having rubber & steel belts slashing around doing serious damage to the PC including the plywood floor. The damage is extensive.Your real world application over-weight condition also exceeds the weight of the E450 frame, but your tires are most vulnerable. The chassis seems to be more forgiving in that regard since I never heard an E450 frame bending or folding or excessive flexing doing damage to the house itself. I also heard the E450's rear axle itself can handle a lot more than Ford rates it for. Apparently Ford built in extra margin into the E450 frame and suspension.