I'm a multi 'bent user and my favorite touring 'bents are Easy Racers. I have a Tour Easy (like the one the above post) and a Gold Rush:
I tour on upright bikes too but I much prefer the Easy Racers.
HP Velos are nice for touring if you don't mind the weight.
In the earth of the future most cycletourists will be riding 'bents if you ask me. In fact I'm pretty sure they'll be on Gold Rush's.
I sometimes pull a two-wheel trailer or a BOB behind my 'bents but I would never go on a long tour with a trailer. I don't like the extra weight of a trailer turning my bike into a brick.
If you insist on using a trailer you could pull it with just about any bent (although most of the short wheelbase 'bents will handle badly at high downhill speeds) and some of the short wheelbase manufacturers recommend against trailers. You could even use a Bacchetta Grio 20 ATT
or a a
Volae Century, for instance.