I looked at several models for my tri-bike. I took into consideration my vehicle, a Dodge Charger. There is no way I would destroy the sexy lines of that roof with a bike rack, so I had a tow hitch installed under the rear and Thule 2 bike rack attached. Cost about $300.

To begin with this will secure the bike, as there is a welded loop to pull a cable through.

When not using the bike, the bike holder folds down so there is just the upright.

When not using your bike at all, a simple socket will take the whole Thule stand off and your just left with the open hitch under your frame. Very easy.

For your consideration for roof rack, trunk rack or hitch, will you be parking in a home garage or driving into enclosed parking areas. I think every person I know with a roof rack has driven under something with their bike on top. This includes fast food and bank drive thru's with that have limit signs at around 8-9 feet.

Are you short. My buddy has an SUV. Now I am 5'10" but to lift my bike on/off his roof is a serious pain, especially after a 5 hour ride and I am bonked.

Can you use your trunk with your trunk rack? These attach to the vehicle with simple hooks and webbing. You may have a place for your bike but no trunk access which just creates another problem. Can you also see through your bike for traffic purposes?

Trunk hitch. These do have a latch at the bottom that lowers the stand away from the vehicle about 45 degrees, which is nice if this is an SUV or hatch back auto. If its a normal trunk, no reason to use at all. Only drawback I have seen is that occasionally I will bottom out the hitch on steep driveways but after 4 years there has been zero damage to either hitch or car.