Never heard of the Sporttube. I just checked it out and it looks like its an enclosure but not quite a cargo box?
What is the impact on range with your skis? Ive read many reports of how the OEM roof rack only decreases range by a negligible amount (1.5-3%) but I assumed with the added height of the ski rack, even w/o skis, would definitely have some additional impact on range.
Normally, I wouldn't care too much about range but in my specific use case (Seattle to Steven's Pass) I charge to 90% and usually get home with ~15%. I like this because I don't have to stop to charge. But according to this thread
Model 3 Roof Rack Options - Comparing Efficiencies I'm worried that the reported ~17% range hit means I will have to stop to charge. This drive is a bit of a slog when there's traffic and I'm just trying to avoid making it longer so I guess i could just charge to 100%, if needed.