I've been making jerky regularly for about 15 years (up to 100 lbs per year wet weight). I make 6 different recipes and give it out as gifts because everyone pesters me for it all the time.
I regularly store the jerky for up to 3 weeks in a vacuum sealed bag.
Two schools of thought here:
1) Get the leanest meat you can from just about any part of the cow, remove all the fat humanly possible, marinate and dehydrate. While it's dehydrating, use paper towels to blot off the grease bubbles that form a few times. Half way through the dehydrating process, flip them and then blot the other side the same way until done. Then vacuum seal into bags and keep in the freezer until you need it put into your food resupply. You can add a desiccant pack if you'd like, but it's not normally necessary.
2) Once all the possible fat is cut away, use a hand crank grinding machine to make ground beef. Dehydrate / blot / flip as in example (1) without marinade. Then put it into a colander and run under hot water while stirring it. This will remove most of the residual fat. Then put it into your marinade until it reconstitutes. Then put into the dehydrator again until done. Once done, vacuum seal it and place into the freezer until you need it put into your food resupply. Again you can add a desiccant packet if you'd like.
With the first method, I've had it packed away in a resupply box for 2 1/2 weeks before use in summer weather with no problems. This was without desiccant. It has a harder texture as you would expect.
With the second method, I've also had it packed away in a resupply box for 3 weeks before use in summer weather with no problems. Again without desiccant. It has a softer, chewier texture as you would expect. It also has more marinade flavoring because of being ground beef and being reconstituted in the marinade before the second dehydrating.
I have never had a problem with it going rancid with any of my recipes.
Hope this helps.
Edit: P.S. It's less expensive and more effective removing the fat yourself. Only you truly know and care about how thorough the fat removal is.