CDL CLASS B TESTING

Hello I want to get my cdl class b license, I already have my permit for class b. I am planning to drive a manual transmission dump truck. When I get my license.
I currently live in Phoenix AZ, and I am not able to find a place that will rent me a dump truck to take my test. I haved email Ryder company to rent a Straight truck, and they said they do not rent for cdl testing purposes.
will a tractor by itself work for testing?
The School I will be testing at, only has a automatic straight truck and I will have a restriction on my license if I past.
Which other vehicle can I use to test for cdl class b license. Can I use a Tractor bobtail to test in? Like the one in the picture?
Thank You.

 

Thank You for your reply.
If I am not able to in the Tractor, which other vehicle will work for testing for class b license.?
Thank You.

 

Thank You Moose1958 for your help.

 

Will I be able to test with no trailer hook on to it? Just the tractor by itself?
Thank You for your help Ridgeline.

 

Okay thanks for your help Moose1958, I think I will just have to go to the office were I will be testing and ask them if I can test in it, with no trailer hook up.
Thank You.