The total IQ of MF is achieved with a tripod... If you bring both formats for handheld shooting, chances are that some images from your MF camera will be inferior in many aspects compared to some of your 35mm shots. Besides, you'll need three MF rolls to get the same number of shots you get with a 35mm roll. And you'll need to carry three times the weight and use three times the space and you'll be worried and/or tired all the time... I'd bring 35mm only.
I would bring three cameras, and here's why: I'd dedicate one to color negative film. For that I'd take one with AE with a small zoom: an SLR or a point-and-shoot, with 5 Ektar (ISO100) rolls and five Portra (ISO400) rolls. So, color resolved for those scenes that can only be in color: in total one camera with one zoom lens, and two kinds of film: everything can be done, even pushing to 1600...
For the main shooting, B&W, I'd take two cameras: one with a moderate wide lens (28 or 35) and another one with a moderate tele (75 or 90) and during all my trip I'd forget about changing lenses. I'd bring just Tri-X (at least 30 rolls) and expose most of it at 400, and some of it at 100 or 1600 if necessary.
One camera ready always: hanging from my shoulder, and the other two hanging in a very small bag with me all the trip.
Cheers,
Juan