The problem you now have is selling the domain because when a new owner gets it the clock starts again from the transfer date - the new owner has got the domain after the trademark was registered and so can lose it at WIPO.
That's an important point.
UDRP:
"(i) circumstances indicating that you have registered
or you have acquired the domain name primarily"
If you sell through an auction like Sedo there are also legal documents you confirm to and sign (awareness of TMs and such). This may hold the seller accountable.
If you have a "generic" name then you would likely be fine; however, if at a later time you felt "protected" and changed usage to be confusingly similar you are asking for trouble.
Also. The US has common-law TM. In other words, it's not necessary to have a formal TM. So if the domain is NOT generic then you should be aware of this.
Finally. If you are genuinely concerned then consider using it legitimately and establishing its use and maybe register your own TM. This would protect you.
Do a search on reverse-hijacking. Where Cybersquatting is illegally sitting on someones TM, reverse-hijacking is illegally attempting to recover a domain surreptitiously.
I always think the UDRP is confusing:
"your domain name has been registered and is being used in bad faith."
A domain name has to be registered before you can use it in bad faith. It's not clear to me that that means "registered in bad faith" and "used in bad faith"