I've installed a BionX D-500 retrofit kit on my Bruce Gordon Rock'n'Road in an effort to get back into the game. Requires 135mm MTB rear axle spacing but your Safari may well have that.
Only a few test rides so far as I bought it back in November just before the snow came. I ride around town and up the White Mt hills now like a 25 year old!
I'm guessing that it will have a range of up to 50 miles with judicious use of the higher assist levels on hills combined with lower assist levels on the flats. A 25 mile loop from home with several steep hills using high assist consumes just over half a battery. That's without the added weight of touring gear. Manufacturer says it has a range of 55-75 miles but that would happen only using the lowest level of assist on the flats. My battery is 48 volts, 11.6 amp hours= 556.8 watt hours. Motor is 500 watts. The assist is seamless and almost instant when the pedals are turned. "Mountain Mode" is like turning on the turbo charger but will drain the battery fast.
Based upon the above estimate I would expect on tour to need overnight lodging with electricity every 40-50 miles or so. Sooner carrying a lot of gear. Further if able to ride on the old fashioned way with an empty tank, unassisted with an extra 17 pounds of motor and battery. I'm still learning it's range. Will report back with updates in the Spring.