Out of curiosity, what exactly are you envisioning here?
I'm a pretty avid mountain biker, and a lockable area where you can fit your bike is a popular request for the truly avid cyclists that like to travel, so I hear that. But modern mountain bikes are quite long, and tall, and I just don't know if realistically it would fit.
My size large mountain bike has a wheelbase of ~1276mm, and has 29in wheels at both ends, which means that the overall length is
~6ft 8in long. Which means it's not going to fit in the Terra bed with the wheels on and the tailgate up. And I doubt that would fit in the Traveler even with the second row seats down.
And I just went out and measured, its ~
44in tall to the handlebars and saddle (both about the same height). Now, I don't know how much vertical space between the floor and roof there is with a normal cab high camper cover/truck topper, but the AI answers seem to say that its ~36-40in of space. Which means, many bikes won't fit vertically either.
If you do a fork mount (remove the front wheel), you MIGHT be able to fit a modern mountain bike inside the 5.5ft bed of the Terra. For instance, my bike without the front wheel on, would be ~5.5ft on the dot. That likely would fit inside the Traveler.
If you do a fork mount, a cool solution would be to do something like the image below. A slide out rack makes it way, way easier (from what I can tell anyway, I've never used one).
View attachment 6932
That said, Mountain bikes are quite a bit longer than other bikes these days. About 8-12in longer from what I can tell. So, a common road bike might fit in the Terra with the wheels on, and of course kids bikes/etc.
Anyway, I'm just curious exactly what you're envisioning.
I'm pretty much resigned to carrying the bike on the bike rack on the back. But that also means that I can't likely use the Travelers spare tire on the back. And if I need the bike inside the traveler, I'll have to use that 40/20/40 split rear seat to slide the bike through the center, with the front wheel off.