Anonymousis it correct to say, regarding to truck availability..

Use "according to truck availability."

Anonymous is it correct to say, regarding to truck availability..

No. Leave out "to".

Regarding truck availability ...

Or

Regarding the availability of [trucks / a truck] ...
_____________

"to" is used in a different phrase with the same meaning:

With regard to truck availability

Ha, I was thinking,
Your load will be delivered promptly, according to truck availability.

Oh for a little context!

- A.

Anonymousregarding to truck availability

It's not correct with the to.

regarding truck availabilty

What is the context in which you envision using it?

EDIT: Beaten to the punch by CJ.

Hate when that happens!