If you're big on mining, I strongly recommend getting a base rather than vehicle mining. Vehicular mining burns a ton of level points for a much lower profit, and especially if you're staying at 30ish, you don't have the LP to spare. A base, on the other hand, just requires Transport Ore (free) and Union Treasurer (4 or 6 total, I forget).
I wrote a skill guide in general in the TW section, but since you're specifically aiming for Esk, I'd suggest some of the following:
-Barriers
-EA/WM
-Everything that alters move speed
-+Shield Commands
-HW and PD
-Ammo Drop
-Aimed Shot
-The gunner tree
-Shield Master
-Lightning Reflexes
You can't actually fit all of that into a level 30 build, so you'll have to pick and choose what's most important to you.
Moving this thread to the DS forum, as it's purely about DS.