If you are burning through tires, Get the suspension checked.
Tire Wearing problems you can detect from sitting in your driver's seat:
1) Steering wheel:
Vibration while driving. Your steering wheel shudders lightly while driving at normal to highway speeds. This indicates a Tire problem or loose steering component in the front suspension. If you feel the vibration in your seat bottom, generally that means the problem is from the rear of the vehicle. A vibration in the steering wheel while stepping on the break indicates brake failure.
2) Steering Gear wear/slop
While at a full stop or in park at idle, try moving your steering wheel to the left and right with one finger. You do this extremely lightly while having your head out the window looking at your wheels. What you are looking for is how far the steering wheel turns before the wheel move. There is no allowable "Free Play" when moving the steering wheel to moving the wheels, both must happen at the same time. If there is any perceivable free play in the steering gear, it must be adjusted (If any adjustments exist) or replaced or rebuild whichever is applicable.
This mostly applies to Box type steering gears. Rack and pinion systems can have play/looseness but usually is a problem in the column itself rather than the gearing system
Problems that require inspection:
3) Loose components in the suspension.
Most times you will not feel loose ball joints/tie rods, etc until they become so far gone replacement is the only option. Inspect as per manual and replace as necessary
Driver caused problems:
4) Carrying loads
This is a hard one for most people to grasp. when the suspension is set up on a vehicle there's no further adjustments that can be made. When a heavy load is introduced, the back of the vehicle lowers, and the front of the vehicle rises. (cantilever effect) and the alignment angles change. this can cause very abnormal tire wear. It is also why overload systems are available to keep the back of a truck close to the original ride height as possible.
Personally I prefer trailering my heavy loads.
Rotation of tires is very important with vehicle that have 4WD and limited slip differentials. The rear tires don't have the freedom to turn at different speeds during cornering, so the tires scrub on turns and wear faster. They should be rotated every oil change.
