Slow speeds: loose trucks
Fast speeds: tight trucks
But "loose" and "tight" are different for every person. If I know I'm not going over about 50km/h I'm happy to have trucks super-loose. On Bomb Squad nights I ride looser than most others, but on downhill missions I ride tighter than most others (except Robbo), but that's probably my nervousness about speed. With more confidence I could probably ride loose trucks at speed.
I prefer to change bushings rather than simply tighten. It doesn't take long.
sliding, carving and bombing can all be done on super lose trucks. On your hussler you would want to stay under 50-60km/h depending on your level of Gnar, you can't carve on tight trucks and sliding is harder, as for bombing KNOW HOW TO SLOW DOWN and just bomb speed wobbles r in you head if you feel like your going to fast slow down.