I used the no damage mod. I can't even begin to list how many times it proved to be useful. I support the /fix command, but in it's original state, fixing everything (truck and trailer) when you want.
On these two scenarios, it will benefit the trolls as much as the rest of the good drivers. So it's a lose-win situation.
Here's my proposal. Keep the /fix command. But make it available on request. So people who want it, ask for it. Here's how. Build a ticket-like system where players who want the /fix command can request it. There can be a moderator that can vet your profile and see your punishment history and determine whether you are a suitable candidate. Let's say you have two or less bans in a calendar year (The last 365 days) You qualify for the /fix command and they enable it on your profile. If they deem you to be a risk, i.e., multiple bans on your profile, you don't get the /fix command enabled for you. Trolls will have no fix command here.
Let's say in this proposal I have given, that one who has qualified for the /fix command gets banned. Undeniable evidence proved the ban was given correctly. They lose their /fix privilege for 30 days. if they are banned again, they lose their /fix command for 90 days. They get banned again, they lose their /fix command for a calendar year(here is where you can align how profiles reset after a year)
So in the end people who end up with the /fix command deserve its benefits. Trolls have nowhere to hide when you look at their punishment history. No /fix for them!