I use multiple Reese style tubes for all sorts of things, here is one of my trucks, there are a total of four tube mounts, one above each frame rail, and then the two "stacked" in the center. I build them pretty bullet proof. The truck is an F550 and I will use them combined to mount a 2500# backhoe (truck has hydrualics wet lines to the rear, off the PTO) for use on my property. You can also use them to mount ANYTHING else and increase stability whilest doing it. I mount a salt spreader from this as well ( it serves as my driveway plow truck). I am building a swing away bike carrier for my 87' XT600 using this same set up on the rear of an F350 and a "repurposed" double crank "crane" jib/winch from a "Gene jack" type older assembly. What I found on the trip to the UP Mich. last summer (third pic) is if it aint EASY to get the bike on/off, many opportunities will be LOST. I will use the same "tri" mount layout on the back of the trailer to have it all consistant/changable. On the 550 the top two are strong enough I may even have my dump bed pivot off them.