The 2017 Starcraft Launch 17QB isn't very large so it is likely you need a scissor jack like the etrailer # TJSC-24. This has a 2,500 lb capacity and adjusts from 5" to 23-3/4" for an 18-3/4" lift. I would compare this to what you have now to see if it is the right fit. Also, you can use your existing bracket unless it is damaged so I wouldn't be too worried about matching up the mounting holes. If you need more of a lift we also have the # UF48-979006 with a 24" lift. view full answer...
I have an axle upgrade option for your 2017 Starcraft Launch Mini Travel Trailer, but we do not have a standard axle that has a hub face measurement of 77-3/4" and a spring center measurement of 59-1/2".
Instead I recommend going with the Timbren Axle-Less Trailer Suspension System w Hubs - Straight Spindle - 5 on 4-1/2 # A35RS545 that has a 3500lb axle rating to match what is currently on your Launch Mini, and bolts directly to the frame of your trailer so hub face and spring center measurements... view full answer...
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