I just bought my lx and want to replace the factory roof bars. My plan is to install a large RTT as I have a family of 4. It appears that most of the tents will occupy the entire roof, so it seems to my inexperienced mind that I should buy some load bars instead of a more expensive full roof rack, like a prinsu etc. Front runner has some load bars for the 80 series but not the 100. Should I just spend the extra 500 and get a full rack?