Great to see you preparing with plenty of time up your sleeve, Andrew,
I have always been aware of the Rodinax tanks but have never used one. But I just watched a neat and tidy demo on YouTube and it raises a few questions from me which might be worthy of consideration prior to your peregrinations.
1. Does the chemical solution totally immerse the complete film or is there an air gap through which the film travels during rotation of the reel during processing?
2. Must the film be agitated by the knob constantly throughout processing to enable intermittent agitation?
3. Is it in any way possible to alter the direction of 'agitation' during processing?
4. Are there internal light traps or other contact surfaces with the film during loading and unloading that could harbour dust particles during processing?
Much of my querying is prompted by my preference for intermittent agitation as a means of increasing acutance by the development of Mackie Lines during development. Over the years I have owned and used a number of Jobo constant agitation machines but I am now back to using inversion agitation tanks and reels and I'm loving my results.
Another concern that I detect is the likelihood of 'bromide drag' as the film appears to only be 'agitated' in one direction (possibly constantly).
I'd be concerned that if the film is out of the solution (in air) for part of the rotation there could be a propensity for bands of unevenness.
The appeal of a 'daylight loading' ability on the road is understandable but I wonder what the alternatives might be? I have always travelled with a changing bag due to the need to load and unload double darks for my 4x5. That includes commercial assignment travelling within Australia and over to Britain. I have a Sinar Black Box with is an attache case with a two-sleeve changing bag in it which means that in transit the case can hold the film holder and/or cartons of film. I also have Harrison light tents from a readily foldable number to the more intricate Jumbo which easily swallows up 8x10 holders.
Such elaborate and costly means might not appeal on your proposed Canadian exploits, but a simple changing bag packs flat in the space of just another shirt. A changing bag will also allow unloading a jammed camera and other such contingency 'repairs' en route.
A 120 size Paterson tank and reel would be less volume as luggage than the Rodinax I suspect, and it allows intermittent inversion/agitation. A Paterson reel will allow 120 and 35mm to be processed and, in the case of 120, TWO rolls of film can be loaded in a single reel. Just in case you do take some 4x5, there is also the possibility of using the Mod54 sheet holder with a 2-reel Paterson tank. I also have Jobo 2500 series tanks and reels but the increases size and volume of the Jobos would not be ideal for the itinerant nature of your task.
I wonder what your preferred soup will be? A liquid concentrate like 'Rodinal' would be a no-brainer but let me also suggest my standard brew: Diafine. Diafine is essentially a 'compensating' two-bath developer which means that, in the case of mixed locations and lighting on frames of a 120 roll you don't need to worry about N, N+ and N- development (if that is what you get into.
Just a few points to ponder given that you have allowed time before the trip to devise a game plan.
All the best,