When the trailer supports are up and the trailer is resting on the tractor, what should you check for?

When the trailer supports are raised and the trailer is resting securely on the tractor, checking the clearance between the tractor frame and the landing gear is essential for safety and proper operation. This clearance ensures that there is enough space to prevent interference between the two components during operation. Proper clearance helps avoid damaging the landing gear or the tractor frame, which can lead to mechanical failures or unsafe driving conditions.

Maintaining the right clearance prevents issues such as binding or chafing that could impair the ability of the trailer to attach or detach from the tractor safely. If the clearance is insufficient, it could lead to more severe problems, including instability while driving or the potential for damage to the components involved.

Other options may address important vehicle checks, but they are not as critical at this specific phase of ensuring the trailer is secure and operating safely in conjunction with the tractor. Checking for excessive weight, alignment of the wheels, and wear on the wheels are all relevant vehicle safety checks but are not directly related to the specific scenario of the trailer supports being raised and the trailer resting on the tractor.