Rooftop Tent Annex question

[TheGerman]

I'm in the market for a roof top tent to put in on the bed rack, so far so easy, besides the usually challenges to perform all the market research and comparison.

Now the real challenge, the annex! I want to use the annex as sleep area as additional sleeping area for one, or even two in a pinch, without having to remove the ladder. I was thinking about at 72" x 30" should be enough per person, it's still camping, right.

The annex for the Guana Wakana 55 would be on the larger size with 100" x 100", but of course the RTT isn't available right now

I'm trying to find the footprint dimensions, for the annex for typical candidates like Tepui Autana 3, Zero23 Walkabout 56, etc...

Any has the measurements or RTT + annex recommendations. And as we're talking about a Gladiator truck bed size matters.

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[MPMB]

We have the Tepui Autana 3 w/ Annex. And have never used the Annex in ~3 years of ownership.

Looking on Tepui's site, it looks possible to put a person on either side of the ladder, but the sagginess of the Annex will make everyone wet from condensation. It'd be neat if you could fashion some fiberglass tent poles to make the Annex bow out.