my opinion, if touring, more gears is always better.
more gears closer together even more better.
worst touring is a long day into a strong headwind
with gears either too big or too small.
you're looking at doubles.........22-36 or 24-38
and triples............40-30-22 or maybe 42-32-24/22
triple will give you more usable gears.
you're gonna be happy with a 22 over a 24 on long uphills loaded.
match that with your biggest cog to get a 15 or 16".
you'll be spending most of your time in the 30, so pick
your cassette range based on that.
a top gear 89 or 90" should be enough, you say you're
not that strong. nothing wrong with coasting....