Look for a good condition used one, ex hire or careful owner who has ‘upgraded’.
I’m also I know someone of similar stature who does this, and I’m sure most of the established name motors will do this for you. 500WH battery is the minimum for ~25-30km range.
Mine is a Gen 4 Bosch (the last which was easily ’tuned’, the later models have started a bit of a war against the tuning chips)
Basically they’ll make it far easier to cycle than to walk uphill, but obviously it’s best to try to get most of your gear onto the bike and not on you on your bike!
Full suspension (as opposed to ‘hardtail’) is recommended if it’s at all a bit rough.
We whiles camp overnight in the ‘bush’ here, all the heavy gear is loaded on the bike on bags, and we carry the (very light but voluminous) sleeping bag or quilt and not much weight on our backs.
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