I would like to add a bit to Mr. Williams response:

1. Another factor to consider is what type aof gravel are you talking about - new loose packed or hard packed coated with "crush & run". An industrial type pneumatic is not well suited on loose gravel - the tires have over 100 psi if air type & solid molded tires come in a variety of duromter ratings - the higher the harder. So the gripping capability is limited. The best gripping tire is a tire form from rubber - bu they wear out faster and a bit more expensive - ask any Linde dealer about that. But inproved tractive effort is the trade off.

2. Is your operation basically level or does it have incline greter than 5%? Height of incline divided by length of the grade. Live in northern Georgia and inclines are often an issue. They only level spot you find here is in a "pool hall".

3. If the hard pack gravel - during the "monsoon" seasons or in the "frozen" northern part of the USA - (spring thaw issues), an industrial pneumatic ain't going to work too well either. A rough terrain forklift maybe better suited - as it is much longer and wider the weight distribution is much better = lower foot print loading on the tires & larger diameter tires. Remeber that an insdustrial fork lift has 60- 65% of the GVW on the smaler rear axle tires when running empty - which is at least 50% of the time. This is when getting mirred down in the gravel is the greatest - especially when the unit is turned.

4. If you decide on an industrial pneuamtic try to get the widest tread tire economically possible or dual drive tire - you will be happier.

5. That guy with the Toyota cushion - had one and wanted your $$$ and was will to tell you anything to get it. "Caviat Empter" (SIC)