There is an engineering explanation to what you are describing. With air-filled tires, the inflation pressure equals the average pressure exerted on the soil regardless of how much weight the tire is carrying. Adding more weight without increasing tire pressure means the tire has to bulge out to have more surface in contact with the ground. In other words, the contact area increases but even though the pressure stays the same you can carry more weight. (With really stiff-walled bias ply tires at low inflation pressures this rule breaks down but within reason it is accurate. The rule assumes the air, not the tire carcass, is carrying the weight.) However, with fluid in the tires, you gain the weight of the fluid which exerts around 1/2 psi with every foot of depth. So, if your tires are inflated to a level 4 feet above the ground, you gain 2 psi of soil contact pressure for the same inflation pressure and the same amount of tire bulge.
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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