Double Rainbow guyouts

Barbara
I'll let someone else address the guyline bit (but I will if nobody else does…)

As for not letting the side down, there are a few possible reasons.
Most likely the floor corners are not connected to the corner tie out points. see pic 3.
I set the DR up in my bedroom and this is what the floor looked like :

That "arrow " pointing to the pole , tells me that those two corners are not pulled out correctly .
Anytime you see wrinkles like that on a tent floor it means something is not set the right way.
In this case that also means that the long sides of the bathtub floor , one in particular, are not standing up enough.
So first I pulled those two corners out , next I repositioned slightly the pole ends (spreading them out, away from each other, just a bit)
This is the result.

Now with the even floor the sides are up .

Franco

Thanks Franco – guess you're the man for the guyline question too – maybe lack of response means no-one uses any extra? Barbara

I just leave a guyline on each end, and set it into the wind. Usually set my trekking poles up in the grommets inside.

There are 4 guyout points on the DR.
One on each side of the main pole and one at each end of the cross strut.
Typically you would pitch the tent with the main pole intro the wind. So the guylines there will help taking some of the pole flex.
Have them long enough so that they can be pegged about 3 feet from the pole tip.
Some will use 2 guylines in an inverted V shape.
You can also help the long side by using a trekking pole under the cross strut as Joe suggested.
There is a grommet under the vent that takes the pole tip, however I prefer to put the handle there and use the tip on the ground as a peg (dig that in a little) as I do with the Contrail.
If you than also use a guyout line over that , attached to the guyout points at the end of the cross strut, you will gain a lot more lateral stability again.
I will add some pictures later on.

Later on.
First shot is the standard set up.

The second is with the pole guyline in place.

The third is with the door side guyline and trekking pole
in place.

Note that this particular guyline is a bit too short , for this a longer one will work better at times, so using two pegs.

Also note that having the handle up the tie out rests over that. On my tent I would paint a bit of silicone over the fabric in that area.
Again this is how I would do it, not necessarily the best or only way.

Franco

I stake the pole guyouts in the inverted V that Franco mentioned, at around 45 degrees to the main pole. However, I also pitch it with the vestibule into the wind rather than the ends, so that may determine where you place you guy lines.

Thanks everybody . I just tried it with hiking poles in the grommets – like it a lot. Next thing I'll try the various line options. In LA there's almost no wind right now so hard to get a good test.