A week ago I purchased an Xlt 4x4. I couldn't fit in more truck for the money on my budget. I will do some add on and a leveling kit. What additional skid plates does the fx4 package include over the 4x4. I realize I need to add a plate over the transfer case. Where else? Also what size tires can you put on the 17 inch rims. It has a 5.0 in it and only 3.31 gears. It has the factory 17 inch rims. Can I run around 33 inch tires if these rims allow for it?