There are suspension lifts and body lifts:
A suspension lift will put everything higher except the axles and is generally preferred for real off road use. This will give you more problems when towing because of the tall receiver, sharper drive line angles and higher center of gravity.
A body lift leaves the frame and power train at stock height but uses spacers to raise the body higher. Although this is not as good for offroading, it will allow you to run taller tires with less hitch compensation required and the CG will stay closer to stock.
My opinion is that tow vehicles should not be lifted but for those that do, using a body lift will create less issues.