Just your mouse.
Click on the left side of the truck, then click and hold the valve stem (arrow) until enough air has leaked out.
You need to click the left tire and press the valve.
Hold the valve stem until enough air has gotten out of the tire.
Just click on the tire (left side of the truck). You are just letting out some air to lower the trailer.
Click the tire on the left side. Letting some air out of the tires will get the trailer unstuck from the low bridge.
It is on the side of the tire. Once you talk to the man with the truck, click the left side, then click and hold where the arrow shows, to let air out of the tire.
On Cryptids Island to let the air out you must first offer to help the gentleman. Click on the truck tire and click down on it til enough air comes out. He will then reward you for your kind being and thoughtfulness.
If you're talking about the guy on Cryptids island, then click on hhis left tire and let all the air out.
Talk to the driver, click the left side tire, then press the valve stem until enough air leaks out.
The trailer is stuck at Loch Ness. Click the left side, then hold the valve stem until enough air gets out.
His trailer is too high to fit under the bridge. Let some air out of its tires to lower it. Click the left tire, then click and hold the valve until enough air gets out.
If the driver had a button, he wouldn't need your help. Let air out of the trailer tires so it can fit under the bridge. Click on the left tire, then click and hold the valve stem until enough air leaks out.
At Loch Ness, the man's trailer is too high to fit under the bridge. Help him by letting some air out of its tires. Click on the left tire, then click and hold on the valve stem to release the air.