The prototype frunk looked like it was about as deep vertically as the Model S single motor frunk is horizontally (into the microwave area). I could see golf bags standing up in the Model X frunk. My back hurt thinking about bending over the nosecone/front bumper at the waist to reach down into the prototype frunk, but a tall item like a golf bag wouldn't have that problem. (The prototype frunk was the same shape as model S frunk, minus the microwave. It was the shape I imagined the Dual motor frunk would be, before it was revealed that dual motor intruded past the microwave) We'll see soon if the final thing is anything like the prototype I guess.
I always wondered if the prototypes were REALLY dual motor. Did anyone actually see the front motor? Isn't it likely they just took a rear-motor MS skateboard and put the MX body on it? If so, the size of the frunk might have been a little bit conceptualized.
If so, now imagine how great this car would be with a folding second row.
That's really what made the original Model S great (D a little less) in this sense, it is phenomenal what can fit into it - the deep frunk is a great addition to an already insanely great trunk.
Model X without a folding second row will just remain a little bit behind that greatness, because even an insanely great frunk as an addition to a mediocre trunk will end up being mediocre overall.
What competitor in a similar price range would you use over a Model X, and is a competitor really going to provide a better experience? If I were in your shoes, I'd just buy/rent an appropriate trailer (the MX can tow!) for those rare times you haul very long objects, and if you those occurrences are not rare then I'd recommend you go with a pickup truck instead of a CUV.