I may be totally missing something but I've had this problem many times. In my case, the answer has been trigonometry. If backing straight results in driveway angle x, backing in at an angle will be at some fraction of that driveway angle. So make an arc as you start back onto the incline, then straighten out on the incline. I like to back to where the driveway and street meet - that is where the passenger side trailer tire goes - at about a 25 degree angle from trailer to street. Then crank and get her up there. It has never failed me. If that makes no sense, chalk it up to being past my bedtime.
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