Spinning Jenny
If you need to install large amounts of wire and you don't want to have to manually roll it out along your fence, then you might want to invest in a spinning jenny.
A spinning jenny is a very simple fence tool that allows you to place your roll of wire (whether it's high tensile wire or something else) and then has a pin that you can knock into the ground or even install on a vehicle. As you move along the fence line, the jenny spins, rolling out the wire you need smoothly while maintaining some tautness so you don't have to spend too much extra time tensioning your wire.
Spinning jennys are cheap, require no power to operate, and can be used with a variety of wire products.
Buy a spinning jenny on Amazon