Well for one I wouldn't commit all Thousand, that's just poor planning. But half should both be fine and plenty. So you can use them in multiple ways. I figure it would be a combination of war dogs, camels and elephants.
Camels, camels have a distinct advantage in warfare, two actually over horses. Horses are faster and more nimble so at first seem much better. But for one die tend to survive poorly in deserts. Camels are hardy and easy to supply. But their real strength is their second advantage. Their smell scares the crap out of horses. Untrained horses just want to bolt when a group of camels charges.
I see a similar advantage for your wolves. Unless their cavalry is very familiar with your wolves as friendly, including the current horses they're riding, there's gonna be panic. Counter charge their cavalry and watch the attack crumble.
Given their size I don't think they'd make amazing raiders. Sure they're wolves but they're huge. Bigger animals tend to be overall slower.
Elephants on the other hand we're the tanks of antiquity. They're slow, hard to maintain and their power to weight ratio isn't terribly efficient. Still they scare the crap out of infantry and can punch a hole in any battleline.
You wolves obviously would have a similar effect. You probably want multiple riders. One to steer our animal while one or two others throw javelins or shoot bows. Maybe even wield lances to stab at enemy cavalry and over shieldwalls.
I'm not sure you're have the mass and thick skin to trample as effectively as an elephant but still a charge should crumble any form of formation relying on shields to hold the enemy back.
So their last function I see akin to war dogs like the Romans and Celts used them. It's said Romans clad their dogs in spiked armor. Given the size of your beasts that's totally an option weight wise but it's going to be expensive. Still they're much rarer then human soldiers.
When used in such a role riders would actually be a bad idea I think. You want them to give in to their instincts. You just want to let them lose upon your enemy's formations. Their sheer weight should crush men and their jaws yourl snap horses.
I also think you need like a dozen handles a wolf for this. Just two leashes with dix men each. You want these beasts aggressive but not to aggressive. Getting them up to Roman Molossus levels of aggression might be a mistake.
Now that above sounds useful there some problems with your idea. A Thousand animals is a viable but small population. Using my proposed 500 in war would be desperate. Though they breed pretty fast replacing numbers isn't the issue. Genetic diversity might be.
Still a larger issue might be the build of the animals itself. Wolves are not horses. The spine of a wolf can't support nearly as much weight. Given the upscaled size I think you'd be fine with a rider up on the shoulders. Probably another joining him and perhaps a third one at the hips. But don't put weight like a small fortification on it's back.
Lastly your salted meat idea. While wolves aren't dogs it's very bad to feed your dog salted foods. Unlike desert dwelling humans they're not evolved to handle dehydration nearly as well or are smart enough to drink accordingly. Don't salt that meat, dry it, smoke it, let them gorge when it's fresh.