The high end shackles are around $85 locally, but you can get them cheaper online. The hangers locally are around twice the cost of shackles locally....so your price is around average if you priced them locally. Online, you could get both for prolly around $200($50 for shackles, $150 for hangers). A flip kit, is going to require a C-notch, and depending on how you look at it, it can lower your payload weight. Your bike prolly weighs ~850lbs(based on the average cruiser).
Can you upload a pic of your truck as it currently sits unloaded? Also, measure how high the rear of bed(or end of tailgate) is from the ground. You might only need shackles & hangers depending on current height.