Quote:
Originally Posted by botsapper
An anecdotal observation, when you see large RVs with extra-long tails turn into deep entrance/exit ramps the sides & corners often strike the road surface. For your extended box instead of a single center caster, the bottom corners may benefit with much lower profile sled-like runners.
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Yeah, that's on my radar. It isn't like runners will cost much, and having them will add to my sanity, whether they are needed or not.
The aero box does have the advantage over RV's and such that it's not square, looking at it from the top-down view. That's why the rear corners tended not to strike in my models. It does make sense that the front corners would be more seriously threatened because the frame hinges but the front corners don't actually move out of the way, considering the pivot location. If I go for a v3 design overhaul the next level is to put in linear slides (like drawer slides) instead of a hinge, so the box translates upwards instead of pivoting. I'm still mulling it over - could be overkill.
After I fab the floor frame I plan on driving around with various loads to prove it out. Having driven with a 4.5" clearance air dam in the Corolla I know where the worst ramps and dips in town are.