Scoutman
Explorer
I have the CVT Mt. MkKinley. We got it in 2014 when the kids were 5 and 2 and still works fine. I'm not familiar with the Tepui, so I can't comment on the differences. We used to be ground tent campers, but the RTT works great for us; I'm sold on them. I can see that in a few years, it might get a little tight, but it's just for sleeping, not hanging out, so I plan on it working for quite a few more years. We have the annex, but honestly, I've never even put it on yet as we have enough room without it.
We're getting ready to pull the trigger on a McKinley shortly. Our kids are 8 and 5 so we're probably in a similar spot. The McKinley seems to be the biggest RTT available that I've found and probably the best option for 4 people where 2 of those are grade school age or older. At 87" of sleeping width that makes about 22" of space per person which I'm sure my sleeping bag is at least that wide probably wider. I hope it works out.