Not sure what you mean by "drop". Do you mean adding a bubble? If so, buy the ones you want, or have dealer add them. Either way, on Friday, have them pull your pop up into one of their bays. Those slabs are level. Use a level (or ask dealer to) then raise or lower the tongue. When the unit is level, stick the little bubble thingys on the exterior... one for side to side and one for front to back.
Where will you be going for your maiden voyage?