Hello! I recently found out that if you visit Dres and then wait for a bit, asteroids start spawning in orbit around it. Deciding to send a probe there (never been anywhere except Kerbin (and moons) and Duna, so was pretty pleased with that regardless), I've so far found started tracking two Class C asteroids in what seem like very well circularized orbits with no extreme inclinations that I can tell. I've never caught an asteroid before, but these seem much easier to get to than near-Kerbin ones (aside from making it to Dres in the first place anyway), and as such look like they might be good for using as sources of ore for refining. The thing I'm not too sure about though, is the idea of using a fuel dump in Dres orbit as a stop off point on the way to Jool a good idea? I know that it takes a lot of delta-V to reach Dres and so if I was just sending a small one way trip to Jool then it probably wouldn't be worth it on account of having to get into and then Dres orbit. However, I'm planning on sending a couple of large carriers (part of the reason why I haven't been interplanetary much is I'm determined to do it with large, inefficient, SSTO carrying carrier ships (Like my first one to Duna back in whatever version of KSP it was: http://imgur.com/a/aGMDH#0 ), and seeing as I want to explore several of Jools moons I've been trying to figure out the best (including coolest, not necessarily the most efficient or reasonable) way of making sure they have plenty of fuel. I've considered using landers to pick up ore from the surfaces, but the amount of extra equipment (mainly part count and space in the hanger bays I'm worried about, rather than mass) seems like it might be best to use asteroids (obviously I'd still need drills, refineries, etc, but I'd save on other parts a lander would need). Two ideas that I've thought of (and feel happy to tell me they're both terrible and there's a better way of doing it) are to either have a refinery and stuff in Dres orbit, which the carriers rendezvous at in order to refuel, or to send a separate mission in advance to Dres which grabs the asteroids and pushes them out from Dres and takes them to Jool as mobile ore sources. My main queries are simply based on trying to find out the feasibility of these ideas. Does anyone know how often a transfer window opens from Dres to Jool, how much delta-V does it take to get there, and overall how difficult is it to go from one to the other? Thankyou in advance