If you've been driving it for three years, with no problems, then I don't think I would worry about buying the Goodyears again. When you go to a scale, your rig is level. When you're driving on most roads in the right lane, the rig is tilted slightly to the right due to the crown in the road. This might be enough to bring that left tire back to it's rated capacity. Additionally, speed is very much a factor. If you drive 65-70, you might have a concern. If you drive 60 or under, that's a lot less heat generated. Finally, your door sticker probably calls for 65 or 70 lbs in the front tires. You should go to the max of 80 if you really have that much weight on the front tires. Your weights are a little suspect, since on my 32' Leprechaun with two street side slides, there is only 4,400 lbs on the front wheels.
CT51