The number 1 requirement for me was to not have a permanent rack so my approach is different than a lot of the folks on this forum. I also have a storage lift mounted to my garage rafters that I use to support and store the basket when it is not on the truck. This also makes it easier to pack and to mount once it is packed.
Mine is sort of a blend in that I use 3 bars (6 mount points to roof) and the Hannibal just sits on those secured with 6 bolts top down through the yakima bars. I can do all of the rack solo:
1-place bars with the towers already in place on the bar from last removal into tower "foot" left in factory rail. This is obviously simple and takes about 4 minutes including grabbing them from garage.
2-lift rack and walk over to side with vehicle on lowest low setting. It helps to have LLAMS tool to drop an additional 20mm and NOT to have silly "rods" which leave the roof an unuseful 2" higher. Hannibal rack is not too heavy to lift with nothing mounted on it but I lift it with the rear awning attached as it's kind of a pain to re-install the awning. Doing this lifting keeps you strong
3-slide rack into place, drop the bolts through by hand, start threads by hand, finish with 13mm, done in about 20 minutes.
4-creatively move the ARB RTT to beside the vehicle, without any insides or the heavy cover....gather your wits, find perfectly balanced hand holds with back to the vehicle, lift with legs not back, lean against, find top edge of RTT to rack edge, start to transition weight to rack, pause, move hands, now rack is your helper holding 1/3 the weight and more as you lift up and then slide further on.
5- bolt RTT down to the conveniently spaced slat cross structure. This takes bout as long as the whole process up to this point as there are 4 mount points but each has 2 sliders with a drop bolt and you screw on the nuts from below, sometimes while the waffleboards are already in your way
6-add RTT insides/bedding and zip on the cover.
7-optionally add the 2.5 meter side awning and plug in the rack mounted lighting wiring loom to vehicle via 7 pin trailer plug.