I am aware of those kickstands. There are two serious drawbacks to that solution, from my perspective. Primarily, you have to carry that structure around with you, with all of the drawbacks that implies, and it would only be really useful in the one in 20 rides where I loaded up with 40-50 pounds even when I was car-free. And second, those are fairly expensive. Which isn't necessarily a factor if you really need it, but I certainly wouldn't recommend that for OP who primarily wants to store his bikes.