Later we found out that the trusses may not have been designed to handle the extra weight, so we're careful about how much stuff we put up there.

Built like a trailer with 2x3 inch exterior walls and 1x2 or 2x2 interior wall const. which makes them very flimsy and difficult even dangerous to repair.Interior paneling is usually a 3/16 inch photo-finished veneer which for the most part isn't even manufactured any longer.Flimsy aluminum siding no longer manufactured and hard to repair.Trying to replace interior wall paneling and/or aluminum siding with heavier materials which is about all that's available with today's material selections can drastically overload exterior walls causing sagging and settling unless reinforced by perimeter piers which still isn't a good idea for lots of engineering reasons.Roof were usual a 1x2 truss system with a rolled aluminum skin place on top.

Right now my ADU is in the framing phase and will be putting the trusses for the roof on.

Oh yeah, I at first did showings by appointment and got stood up.

They lean towards a hybrid system using their panels for exterior walls, and perhaps flooring, but using a steel framing for the roof trusses. 

The first thing that stood out to me was how the head of TKP, Josh Weidman, had a decent online presence – videos on strategic renovations, rental markets, tenant retention, etc. – and the content wasn’t a sales pitch.

We had to replace more than half of the roof, including over 40 trusses and jacks.

I've been a web designer for 12 years and I didn't know what that stood for.

Of all of the points listed there, one of them stood out the most to me: May be required to pay third party data access fee. 

You've spent months researching REI and no strategy has stood out as appealing to you?