nope. Thankfully most of the 3 nations can be soloed or low-manned without trusts, especially if you have pet jobs available and 117+ gear
I helped an LS mate get most of those via duo or trio. Some will be a pain though (some worm in Garbage shi-t-ty he11 for example which killed our pets and us with a move... for example)
There are also weakening items you can buy from a guy near the jugner outpost. They make a significant difference for a lot of battles.
Edited, Feb 19th 2015 1:59pm by Olorinus