Driving Lights

I have a faithful 91 MPV V6 that waits patiently for us to return to the mountains of Mexico each winter. It has been a great machine but last winter brought forth a shortcoming that I am looking for help to fix. Where we now live is in an area of "free range" and we have all sorts of cattle and horses that wander out on the road during the night. The area is very dark and we experienced numerous close calls because the lights just didn't reach far enough. Does anyone have any suggestions as to the type of lights I need as well as where they should be mounted? I don't want to head to the auto supply place and get a pair of lights to find that when I get to Mexico they will not do the job. Will really appreciate any help and advice. Bob