Regarding the ramp... doesn't it look like the top of the tailgate could separate from the lower body and contain a ramp? The gate would not also not need to be that thick if it didn't need to hold a ramp? Maybe I'm just wishing... but I'm sure hopeful!
1) Standard trailer towing hitch receiver (not sure what it is called, but the square tube you can add different size balls to)
2) Heads-Up display
3) Fold-down wall between cabin and bed
4) Romulan Cloaking device :)~