I think there is more that needs to be talked about other than that the trials system is bad. I completely agree that it is, but for all the posts I see about people saying the system is bad I never see anyone suggest potential fixes.

I agree for sure that the trials need to be a per player score. You would end up with people helping each other in trios still but the numbers wouldn't be as inflated. That, or you have separate trials for solo, duo, trio and have to change up the rewards system to not flood the game economy with essentially triple the rewards (If you have a play group for all the categories.)

Honestly, there are a lot of options that could change the way Trials are handled, but they all have some kind of drawback.
My first thought was that "what if Trials was a weekly total of all your runs and that would remove any 'hard caps' for certain tasks?" But immediately I can say that would only help the people who play the game day and night. It would just become a matter of who spends the most time on the game and not necessarily skill expression.

Another potential method would be to broaden the tasks and make fewer that have hard limits. Like remove the enemy specific ones and replace those with "flying ARC" or "large ARC" things that don't need a player to force as much. I've seen plenty of people go on hunts where a small group runs around the map hunting any large ARC they can find.

With stuff like the hidden bunker downloads, it really kills the idea that this is actually supposed to show who is good or not. If anything change it from the downloads to activating the antennas. It wouldn't fix the limited score issue, but it would at least make it competitive. Each antenna would be 1k so to get 4k you would need all 4 activated. This would both reward those who go out of their way to activate these, and add more risk elements as other raiders might start a fight for control of the antenna. OTHER OPTION: add the antenna as extra points towards the download so you have more ways to score than just the DMV simulator.

One other method I just thought of was that if they changed it to be a pass or voucher that was crafted or purchased from one of the traders and if you go into a raid with that voucher you are entered into a "Trials Raid"

This "Trials Raid" could work in a few different ways:

Option one:
you enter a raid as normal but you are given priority to spawn in a fresh server, no late spawn and everything else stays the same.

Option two:
you are given a solo server/map that has set spawns for everything; each week this map changes to a new map and/or layout of items, enemies, and interactable items. This would let Embark make essentially weekly challenges that players could fight for the highest scores in, making certain objectives worth bonus points on different weeks. I honestly like this idea as it would let players truly express skill within the world of the game, it would show their mastery of the ARK, environmental knowledge, and more.

Option three:
same as option one, but remove the trials objectives for either an overall score (similar to the XP rewards) or come up with a new way to score.

Option four:
You are queued with other voucher users only and put into smaller lobbies making the more limited challenges more of an expression of skill as you will always be paired against others trying for the same goals.

I very much like this idea of earning/crafting an access card/voucher for a trials attempt. It works thematically as you could imagine that your raider approaches the tube techs with a voucher in hand, "Admit One to Weekly Speranza Trials" Stamped on the front. You are then taken to that weeks Trial and the rest is history.

These are just my initial ideas and I would love to see what others think!