Did some searching and this is all I could find on what limits there are on trial accounts....
Removed the 15 day character age requirement for house placement
Players are not allowed to place a house while on a trial account
Players are not allowed to co-own or be traded a house while on a trial account
Trial accounts have travel restrictions –
Cannot visit Felucca dungeons or Felucca T2A
Trial Accounts have the following resource restrictions -
Will only receive basic ores and logs (iron, plain logs) even if they'd otherwise qualify for better types
Will not receive sand or stone when mining
Trial Account Misc. restrictions -
Will not receive ML rewards for resource gathering (jewels, ingredients, and white pearls while fishing)
Will not receive rewards, monster kill points, or virtue points from champ spawns
Will not get scrolls while doing champ spawns
Will not gain Justice virtue points for killing murderers
Cannot use Valor or Justice virtues
Cannot Protect or be Protected by another player
Can not join factions or faction aligned guilds
If in a guild they will be removed from the guild, if their guild joins a faction
Cannot use Scrolls of Alacrity, Power Scrolls, Stat Scrolls, or Scrolls of Transcendence
Cannot use Commodity Deeds
Cannot do Community Collections
Cannot use Soulstones or fragment soulstones
Cannot use Pet summoning balls
Cannot use Bracelets of Binding
Cannot use the Bag of Sending
Cannot do any repeatable quests – even if they are normally repeatable
Cannot acquire BOD’s