advances or changes in the standards in the last 25 years?
X-7780-A for my 1977 23′ Transmode, “Front GAWR = 4,200 lbs, rear GAWR = 7,000 lbs for a total of 10,500 lbs with everything including people but without fuel or coolant.” My fully loaded coach weights in at 4,160 lbs front and 6,180 lbs rear for a total of 10,340 lbs with both of us aboard. “It is important that the tires on your vehicle be of the proper size, and be properly inflated. It is important to avoid over-inflation as well as under-inflation. See SERVICE AND MAINTENANCE section for proper tire inflation pressures.” “Note: The cold inflation pressures for your tires are: Bias-ply or Bias-belted. . . .60 psi Radial Tires . . . . . . . . . . . .65 psi For sustained driving over 65 mph, cold inflation pressures should be increased 10 psi above the recommended cold inflation pressures.” Note that two different manuals for succeeding years specify different pressure increases for speeds over 65 mph, `76 specify adding 5 psi and `77, & `78 specify adding 10 psi. “When replacing tir
