| Fluid Level | |
| Tightness | |
| Leaking | |
| Looseness |
| You should assume that this posted clearance is correct | |
| Driving close to the center line will get you a few more inches of clearance | |
| If you`re carrying a heavier load your required clearance may be more than you think | |
| If you`re carrying a lighter load your required clearance may be more than you think |
| At the beginning and end of a trip | |
| Every 4 hours or 200 miles | |
| At every break during a trip | |
| At the beginning and half-way through a trip |