Go for It!
Totally do-able ride. Even with 100lbs of gear. The only challenge will be the mountain assents. Speed is not your objective so make sure your gear ratios are designed for climbing and the bike,tires and gears are proven brands for long distance touring. I rode a fully loaded mountain bike 4000 kl through South America having not touched a bicycle in 20 years, so you won't have any insurmountable problems. You and your load is 250 lbs not counting the bike itself; there is nothing impossible about your trip.
Have fun and I wish I were there to join you.
cheers!