Some warders are really easy and you can totally solo them with pretty much any melee plus trusts. I guess THF suggested so you get more chances on Torques (supposing TH works for them but I think it does?)
Among this category of easy ones I can list: Mercy, Loayalty, Dignity, Hope, Temperance (?)
Temperance is technically doable in this list, but you're gonna need a good distribution of different damage types, and it's gonna take quite a while alas, so not very practical for "farming" =/
Faith is very easy to solo on SCH if you have the job geared up.
Justice is a pain and requires a job able to AoE and kill those adds fast. Easy on BLU, maybe doable on GEO and BLM? I doubt on GEO, maybe possible on BLM.
Prudence is a pain regardless, it's a bit random and annoying with those disappear/swap/targetlock mechanics. I've done it during trust campaign but I also died several times.
Much easier with a friend and trusts, one of you with trusts on one target, the other one "tanks" the second hpmede.
Love is easy on BST, not too bad on SMN, maybe PUP too I dunno.
You have to deal with the charm from the main boss (easily avoidable with pets or trust tank) and with the adds. For those you kinda need an AoE job so again BLU, BLM etc.
I don't really remember Fortitude atm, sorry.