Howdee, LIW, and welcome to the Roo side of things!
1. I believe PUGs now offer two options for mounting: clip mount and velcro mount. Clip mounting ships with some spring clips (like industrial clothespins) that clip onto the top hardware. You can check their website and pick up something similar online or in-person from a big-box hardware store.
Velcro mount PUGs ship with a long strip of 2" velcro to attach to the inside lip of the bunk end. This stuff is also readily available online. All pugs should have loop velcro stitched on, so if you choose to - you can attach the velcro to the inside lip of the bunk opening. Benefit is that you can leave the PUGs attached when you fold the bunk closed and close the bunk end, no matter WHAT clamp style you have. (This is how we do it, btw).
If your pugs have the elastic lines with clips, i suggest gathering them on each side to a single inexpensive (!) aluminum or plastic carabiner - two per tent end. This lets you clip/unclip the two carabiners together underneath the bunk when setting up/taking down - pretty fast.
2. You might give Popup Gizmos a call to see how your 21TQX pugs will fit the ROO bunks. Typically the difference is tha the front bunk is bigger/longer than the back bunk, to accommodate the longer distance from the sloped front end to the leading edge of the PUG, vs the shorter distance from the flat back of the coach to the trailing edge of the back PUG.
3. The newest Roos feature permanently attached tenting that is sealed around the edge of the bunk door, there is only the most negligible gap at the lower corner, where the tending turns 90° from the door end to the leading face of the trailer. I wouldn't be concerned with this - the thin vinyl fabric itself will be a much bigger source of heat/cold transmission in the weather. People have made inserts out of Reflectix (some have covered these inserts in fleece material), and we've even had an inexpensive roll of the stuff that we deployed around the outer edge in very cold/winter camping.
We've since purchased PUG's insulated liner (it's like oven mitt material) and I'm looking forward to installing that next.
Just my .02. Hope this helps!
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2022 Rockwood Roo 235S
15kBTU AC; 12v fridge; 1kW roof-mounted solar panels; 80 amp MPPT charge controller; 3,500w pure sine wave inverter; 30a automatic transfer switch; MicroAir EasyStart, 600ah Chins LiFePo; Honda EU2200i (with Hutch Mountain propane conversion kit) gathering dust in the storage unit.
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