I've just purchased a Bob Yak touring trailer for my Moustache Xroad HT. The bikes rack does interfer with fitting, found easist way is to remove trailer quick release wheel, changes angle of yoke which allows me to squeeze it onto axle. On plus sides its never coming off when under way and nobody is going to remove it from bike in hurry. Also need to change washers on bolts that bolt rack to bike, yoke rubs against one. Only taken it once around block and up hill with about 15-20kg, front of bike bit wobbly at low speed but ok +10kmhr, maybe more rider thing which just needs a bit of time towing it.
Impressed with 90L bag, takes 2man tent, 2 compact sleeping bag, thermarest and pile of clothes I threw in from laundry basket. Shouldn't have any problems suportting 2 on extended tours, which is plan. Still have option of panniers on bikes for additional items.
Having just one big bag to carry in and out of accommodation instead of few panniers will be plus when touring with wife, she can now have unladen bike. Bought extra battery so wife and I now have 1875wh between us, I'll need extra power for towing.
When touring with my son he will ride unladen normal bike and I'll carry all camping gear plus 2 spare batteries (borrow wife's).
I did look at toppeak journey but model they had didn't support 9mm QR axle plus it was only 65l bag. A bit two small to support 2 campers without panniers.
While single wheel trailers have few pluses especially on tight tracks one benefit of 2 wheel kids trailers is drivers give you lot more room. My sister found this out while touring in France, they bought cheap kids one to carry luggage. I don't think drivers would give 1 or 2 wheel cargo trailer same courtesy.
Well provide more feedback once I've done few more trips with trailer. Just waiting for fine and free weekend.