I learned this the hard way. I didn't realize that any collected items of weight with your SRV, get transferred to the ship when boarding! So if you have no cargo rack in your ship, then you can't board with the SRV!! This doesn't appear to be the case with "normal" minerals you scoop up though (Sulfer, Iron, Carbon, etc. . .)
But don't panic, as frustrating / annoying as it may be. Before heading all the way back home to pick up a cargo rack, use the eddb.io website to locate a station close to your current location. You can even filter the search for stations that have cargo racks for sale. I happened to find a station just a bit over 9 Ly away from me, and I'm now currently waiting for one of my cargo racks that I had in storage to be transferred (45 mins. I didn't feel like buying something new that I already had in storage).
Anyway, just wanted to mention this for anyone just getting into collecting items to unlock engineering. Carry on. . .
But don't panic, as frustrating / annoying as it may be. Before heading all the way back home to pick up a cargo rack, use the eddb.io website to locate a station close to your current location. You can even filter the search for stations that have cargo racks for sale. I happened to find a station just a bit over 9 Ly away from me, and I'm now currently waiting for one of my cargo racks that I had in storage to be transferred (45 mins. I didn't feel like buying something new that I already had in storage).
Anyway, just wanted to mention this for anyone just getting into collecting items to unlock engineering. Carry on. . .