Killing a moose is the easy part, the real work begins after you have him down. You need a buddy. If you have to hunt alone, take along 50' of 3/8" poly rope for tying out the legs. A good axe, bone saw is convenient, but not a must, at least one quality hunting knife and sharpending stone, two are better. You can use the axe to make stakes for tying out the legs to allow easier cleaning/gutting if there are no suitable trees/shrubs available, to clear brush and to split/quarter the animal. (a saw is cleaner, less bone chips, but if weight is a concern...)
A large Canada moose quarter will easily run in excess of 100lbs, even with the hide and leg cut off. Even using a pack frame, that is eight trips and a crap load of work if you shoot your animal any distance from the nearest road or ATV trail. In BC I would assume you would also have to worry about bear/wolf/coyotes claiming your kill when you're away.
We've had to pack some moose out before, but I've passed on a lot more Boone & Crockett class animals simply because I knew there was no practical way I could get the meat out before it spoiled and/or bears/coyotes got to it. This is one of those situations where you'd have to take your frying pan and 10lbs of onions and eat the animal on-site!
If you're going to be hunting from an ATV, I'd pack along a chainsaw and winch or come-along. Can be a real time saver if you need to clear a few trees to get to a kill site or winch an animal up a steep slope, etc...
I usually keep 1-2 8'X8' tarps or similar size with the bike. Helps keep the quarters clean and free of debris, leaves, needles and hair. I like to get my meat cooled down ASAP, so pack along cheesecloth meat socks. The tarps help keep things clean. You don't want to wrap the meat in plastic however, as it will cause it to spoil a lot faster.
If your province permits, you can tote along the call of your choice, although in areas with high moose densities, you almost don't need to call, just find an area where 2-3 trails intersect and wait for your animal to come to you.
In terms of rifles/calibers...moose really aren't hard to kill. Put a bullet in the vitals and you'll have a dead moose. There are probably upwards of 15,000 moose killed on the island of Newfoundland every year with the just the .303 British alone. The .308Win with 180gr bullet, .30-06, .300 WSM/Win Mag, .30-30 all kill moose just fine. Bullet placement is far more important than the caliber you're shooting.
Know the moose vitals. They're different than for a Whitetail and you should be fine.
Moose hunting is a lot more fun with friends. The trip and good times are just as important as the kill from my perspective. Good luck with your hunt!