Your going to want to be very careful with a trap bar. It’s an exercise that you don’t want to move too slow on negatives. Even the positive.
I don’t like exposing the deep muscles of the low back to that much time under load. More on this at the end of this post.
I’m talking about the multifidus and iliocostalis lumborum muscles. Not the erectors. They are easy to overtrain and injure. Worse yet blow a disc as a result
Even the DB squat can become a problem if you go too heavy and do use good form. I talking about 40 -50 pound DB’s
The goblet works great for 30-10-30 and 30-30-30 if you can hold a DB that long. I hold it against my chest. Never out in front.
I used to do the trap bar standing on a plate for more range of motion. I used 30-10-30 a few times.
Even 130 pounds that slow was enough to remember an injury I had.
I now think a 30 second negative or even a 10 second negative is to slow for any deadlift.
I think trap bar work would be better with high reps at about a 2-2 or 3-3 speed. Maybe even to rest pause.
It might be the only exercise I would not move slow with. Proabaly the SLDL as well
Many years ago I got hurt doing the TBDL with a 10-10 speed. I did a rest pause. One rep 10-10 with 10 seconds between reps.
It will put you on the floor for a few minutes. I worked up to 250 and my back went out.
Be careful. I still like to use 30/30/30 or 30/10/30 . Or a hybrid of 30/30/30 with 10/10 But for lowback I like a machine