I have an 8 foot Land Pride - LPGS. It has scarifiers. When I use it on my mile long gravel driveway - looks like the picture Gordon has posted. 2nd picture down. I don't think a rear tailgate would be of much help to me. I DO have a ROBB if I need to move dirt. I can roll the ROBB over to scarifiers only.
Besides - because of the side skids on the LPGS - it won't really dig down like the ROBB will. However - if I set the scarifiers to full depth - might be a different story.
I have never set the scarifiers so deep on the LPGS that the two blades couldn't level/smooth it out like a pool table.
I only use the "heavy implements" in areas of potholes, riffles, wash out. I've never drug the entire length of my driveway. No need to - its set up hard as concrete.