Solo / Group PvE Content?

[Fraxinus]

Hello everyone!
I played this game for a while back when it was live, but I never really got to the endgame (my highest level character was somewhere around 35, I think).

So I have a few questions for any kind people here who feel like answering them.

Basically, my favorite thing to do in a game like this is to solo roam. I love to roam around, exploring, doing quests, solo'ing Stages 1 & 2 of PQs when I can, grouping up with people if I run into them and we're trying to do the same PQ... stuff like that. I dabble in RvR but I don't enjoy it as much, and I don't really think I'd be able to commit enough time to be part of an active guild.

That being said, two questions:
1. Is this a viable approach to play when I reach end-game? Are there enough quests / PQs / dungeons that I could actually get some endgame gear by myself or by grouping up with a few other randos to do dungeons when I can?

2. What characters are the best for this type of play? Please note that I prefer melee if possible, and I lean Destruction (although I have tried a couple Order characters too). So far I've had pretty good luck with Blackguard up to early T3, but I would like to know if there are other characters who are just as suited to the "lone wanderer" type of playstyle.

Thanks in advance, everyone!
-Fraxinus