Rotopax you'll be able to use the mounts they sell. We will be releasing our load panels soon which will make mounting these much easier but they bolt up to a crossbar with a couple of tnuts and bolts easily.

Boxes most people drill and bolt direct to some tnuts in the extrusion. That way the hardware gets locked inside the box and they are not going anywhere. This is the go to method for Plano and Pelican style cases.

As far as Maxtrax go, a lot of people just use carriage bolts and some wing nuts, but you can also pick up their mounting pins as well. Our Load panels we are making will also have locations for these to mount to.

The shovel is really easy, just pick up a couple of quick fists and bolt them to the extrusion. If you wanted it mounted off the side you could also pick up our new awning mounts and bolt them to that but it would be a bit more expensive. You can also accomplish the same thing with a couple of L brackets from a local hardware store.