I’ve run into many of those same issues. The taper makes it awkward to fit our camp kitchen bag, so there is airspace underneath. The boxes aren’t sized ideal for our gear, though they are nice and fit the drawers well.I did the same and decided against. My buddy had them in his PW with RSI topper and they really squeeze the head space. The other draw back is they are pretty heavy I think around 200lbs. The drawers are not square so the taper hinders certain things like his blackstone grill would not fit due to the shape of the drawers. They would not have worked with my GFC as they took up too much space. They are well built tho and I can see for some applications they would be nice just not for me.
Your comment on the GFC is appropriate, because that is one of my concerns too for our SP. I’ve thought about building something out of 80/20 for the sides and then having open space in the middle and somewhere to sit on the sides. Just not sure where I’ll get the time to do it. And Goose Gear is pricey to just buy. We’ll see. I have a feeling I’ll take it out, but not until the SP is on, because otherwise, we have little secure storage.