I just got a new Reese dual cam set up hooked up to our trailer, and indeed the propane tanks were in the way for the brackets, what the installer did, they just took the propane bottles off, and moved the plate where the bottles sit on forward, that thing is just screwd on to the a frame with selftapper screws,I tought it would have been welded on.
I'm sure yours would be screwed down as well, just move it foreward.
2008 Jeep Grand Cherokee,Laredo, auto, 3.0L diesel
2005 Chevrolet 1500 silverado 4x4
2010 Shadow cruiser 195WBS