Hello @
Graeme.W . First of all welcome to the Forum.
About your question, well, I've talked with people who have walked the Frances and the Portuguese way and they say that you have, in terms of comparison, almost the same percentage of asphalt and off road trails. It's almost impossible not to pass on a couple of segments of national road in our days. I remember that after Tuy we caught a large bit of road walking. But you will also fin wonderful off road tracks
(one of the things that I don't get out of my mind it's to see the bay of Vigo from the top of a mountain trail).
You will find some hills, the worst one after Ponte de Lima (the Labruja Mountain, where you go up to 500 meters on a very steep "climb"). But it totally compensates to see the wonderful view from the top
I will also do the Caminho again in May so we can possibly have the opportunity to meet each other
You can contact me to
metalmelitia666@gmail.com
@
vicrev , wild camping in Portugal it's some sort forbidden, unless you contact authorities and have a permission/license from the Portuguese Mountain and Camping Federation. Yeah, I know, it kinda sucks, here in Portugal they see camping more has a Money thing, than a way of life :/
Best Regards
Diogo Martins