Upload & Sell: On
Keep in mind the CPS loan is for two weeks total, including shipping to and from. So your actual use time is just over a week, unless you next day air ship it back. Still, it is under two weeks total and they don't do extensions. You'll also need to check on availability and their ship dates -- usually it is scheduled in advance and at their convenience of returns from previous CPS member loan.
I've managed to use their gear for a couple assignments, but they were for a couple days within the loan period, so I was well bracketed time-wise, plus, I made plans for back-up gear in case the CPS stuff didn't come through. Also, scheduled a month or two in advance. Both times I was successful in getting the gear following that method.
If you need gear for two weeks or more, I recommend renting, or better buying (then sell at the end of the needed time period, or keep).