I am hooking up electric to my new modular home in Oklahoma and will be direct burying the wire from the pole to the meter at the house. What type of wire do I need?

Typically a 4 wire direct buried cable called URD, Underground Residential Distribution, cable is used.

Can be purchased at any electrical distributor, I believe the large box hardware stores carry it also.

Need to be sure you purchase and install the correct size for your service.