I think one of the main things is how quick you want to flip one, demanding a high price will limit those that would be truly interested and can afford it. If you did this I would stay as stock as possible and then when you drop a line and hook a winner make them pay you for any upgrades such as radios, lockers, lift and the like. That way you minimize your initial outlay and maximize your profit and time. Plus all of the upgrades can be charged out at full price with labor and not be a part of the asking price. You may want a display truck with a bunch of upgrades so that people can see what their rig would and could look as an enticement.