Bed Rack for RTT, ideas on best setup

I am looking at moving from a RTT mounted on a cap to a bed rack to help improve gas mileage during these insane gas prices. I have a hardtop RTT, but also have an annex room that attaches to it. I was looking to see what options might exist for adjustable height bed racks? I was hoping to lower the rack when driving to bring the tent below the cab line, and then lift it when I am ready to camp so I can use the annex room. Has anyone seen anything like this? All the adjustable racks I have seen do not go low enough to bring a tent behind the cab. Also any other ideas for good racks to mount a tent in this configuration would be awesome. Thanks!

 

I did a lot of research on this as it is exactly what I wanted to do. I found that scissor jacks were the best option with guide rails. There are some trailers with this technology but haven't seen one on the bed just yet. Check out the TRD Sport trailer thread.