And the tires - that load rating is NOT a "recommendation".
I believe they changed that - Toyota was tired of getting burned when Motorhome builders flaunted the law by "Re-Rating" the chassis by adding overload springs and funky Siamese dual wheels to a semi-floating axle that couldn't take the extra load.
And/Or the Motorhome builders added a Tag Axle on air springs to carry part of the load, allowing them to stretch the heck out of the chassis - and the owners never checked the pressure in the airbags, rendering it inert and throwing even more weight on the drive axle.
Oh, and no brakes on the tag axles, either.
Then Toyota was left to pick up the pieces when the axles broke under warranty - they shipped a lot of "Free" crated full-floater axle kits for dealer retrofit (with a set of dual rims, tires not included) and that couldn't have been cheap.
Toyota stopped selling Cab Chassis "Incomplete Vehicles" in the US for many years till that law was modified. AIUI, Now if the final manufacturer re-rates it, they are totally responsible for it, warranty and legal liability.
Been there, Done that, checked the air on those tag axles weekly like a religion.
Dad lost the left rear tires on the 84 or 86 Dolphin Motorhome when the axle shaft snapped just outboard of the bearings, and those tires (still bolted to the brake drum) ripped the hell out of the holding tanks and the bathroom floor on their way out the back wall... Then it dropped him on the freeway still going about 45 - fast stop.
We had to get a trailer hitch on the Cressida, rent a box trailer, and go pick up all the contents while the motorhome was in the shop. For almost two months - after they installed the new axle in Barstow, we had to literally duct-tape the body together and limp it to the Dolphin factory in Perris.
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