First, you'll need a powerful vehicle to tow a large load. Something like a pickup truck, SUV, or heavy-duty van will do the trick. Next, back your vehicle up to whatever it is you'd like to tow--you can pull other vehicles and trailers in PZ. Stand between your vehicle and the object in question, and press the V key. This will bring up your vehicle radial menu. Select the option to hitch your object to your vehicle. Easy peasy.