If you read this forum long enough you'll find a way to double what you've spent already.
You've got a good handle on it. What do you plan on using to level the 5er (side to side)? I just use 2x8 pressure treated wood planks. They're a lot cheaper than the plastic stacking Legos but they take more storage space and can be heavy when wet.
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)