aight it is simple job for marauders, you can actually get pretty far with the ball, your key skills for huttball is:
Force charge: use to forcecharge back on the people who knock you back. use to charge through fire with the ball to score (or up from the pit to the endzone)
undieing rage: gives u "immunity", really good if u are carrying the ball through the last fire trap.
unleash: u need to use it so you dont get stunned in fire traps.
initmidating roar: always helps to keep them off you.
(ofc the rest of ur defensive skills needs to be popped, especially predation for a little extra movement buff)
When I play huttball i can sometimes score with the help of my teammates, if I am lucky that the enemy is positioned poorly (for my force charge)
If you are not running the ball, go for the casters in the background, try to move around the edges, and when they have the ball use deadly throw on the ball carrier to give him trauma (reduction in the healing they recieve) and kill the healers in the back