Jim,
It’s important to prioritize safety when working under the bus. Never go under it relying solely on the airbags for support; it’s not worth the risk. While the chance of a failure is low, it’s a risk you shouldn’t take.
You might want to look up various methods people use to access the underside. For instance, Dale J uses steel posts, while I use a pit or a combination of double jacks. Harry has crafted some impressive ramps out of railroad ties. Many others have shared great ideas as well.
The good news is that once you’re underneath, you can often sit up comfortably between the wheels and reach whatever you need to access.
If you’re planning to do some of your own maintenance, this is a great opportunity to visit Harbor Freight or Northern Tool and invest in some jacks and tools to help you out.
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