Ton – what electric bike did you get in the end? Photos would be good to see.
I know a couple who did a big trip around France this summer doing the same – and they were camping as well. A lot of superlight kit, custom made framebags, 30L rucksack and a roll (including sleeping bag) on the bars. Kitted up like that you can ride ‘real’ trails.
A mate used to pull his BoB trailer on his Cannondale full sus but it’s bridleways only then (and encourages you to carry more than you need). We did a B&B trip across Scotland with 30L rucksacks and 10L rolls on seatpost racks.
Depends on your priorities. A sus bike is definitely a compromise for luggage carrying but if you’re going to do riding where you’ll enjoy having that bike more then it’s worth it.