@Beardystarstuff ,
For relatively short (5-6 days) tours in the terrain you describe your Rad Rover will probably be fine. I'd strongly suggest making some long (50+ mile) day rides and a couple of short overnights to shake everything down and be sure it will all work for you. Better to figure all that out on a short trip than late at night on a longer trip.
You are no doubt correct that you can put together a plausible touring rig for quite a bit less money. Please understand that this thread is titled "Best bike for long distance touring", not "Reasonably priced good enough bike for touring".
I also think you wildly underestimate the effects that frame geometry have on ergonomics. If I recall the Rad Rover has basically one size, and depending on your proportions that may work fine or it may be a torture device. In general mountain bikes (and to a lesser extent road bikes) don't have a geometry that is conducive to day-in, day-out, long distance riding -- unless you are a super athlete or have a very high pain threshold. Those little things add up and those little things cost money.
Also, that Rohloff + Gates belt drivetrain costs a bit more than you think. Yes, you can get a Rohloff hub on Amazon for $1200, but when you factor in the fact that you need to custom-build a wheel, you are forced to use a mid-drive (so no mass-produced frame) the cost premium for the Rohloff+Gates is realistically like $3000 or more.
I think the big limiting factors you'd have with the Rad are the aforementioned ergonomic issues and the limited gear range. Yes, the granny gear on the new Rads greatly improves things, but you are still left with only 8 speeds and a relatively narrow range of speeds where you can efficiently pedal.
Distance touring, in the end, is about efficiency. And there are a couple of important factors to consider with efficiency:
- If you are in serious pain, discomfort, or are injured you are not going to be very efficient
- Both e-bike motors and humans are at peak efficiency in fairly narrow RPM ranges
- The overall machine (human + e-bike) is going to be at peak efficiency when both are sharing the load
And "efficiency" is the difference between easy and fun 60 mile days and 50 mile death marches. From my standpoint a premium of thousands of dollars is well worth it if I avoid death marches and epics.