Super_Dave wrote:
Is a tipping point in hose length when these support systems become more mandatory?
I don't think length is the sole issue, but is a factor. You just want to avoid low spots, and the ideal slope is 1/4" per foot. Not that you're going to measure or anything, you just want the hose to drain, and not collect solids in a low spot. A long gradual slope is better than a foot of straight drop at the valve, and then the rest laying flat without any slope.
Cummins12V98 wrote:
I have to say I really like this system! Some jurisdictions require the hose be elevated from the ground!

Pretty sure that is the one we use, or at least very similar. It all folds up into about a 10" square box when stowed. Hauling around 10' lengths of rain gutter doesn't appeal to me.