Pilot,
Agree with you about weight training because I've lifted for decades, first at a gym, next with my own free weights and a versatile bench at home and finally with a complete Bowflex machine which I still use. So I do know the difference between healthy weight lifting with slow 3-count reps and over-weghting with "thrown" weights and I'm betting you do too as you mention "smart training".
You may lift well within your capacity and that's OK. Your advice to also use hiking with a weighted pack is good B/C that can't be duplicated well, even on a treadmill, which I'm forced to do in the summer months due to Las Vegas' extreme heat. In those summer months I try to get to the mountains at 8,000 to 10,000 feet but that's an hour's drive one way. The altitude is good training, even if only done once a week.