4-5 pounds? Sharing is caring 
Iāve done it twice but they were only 2lb and 3lb each. I would recommend doing a test run prior to attempting such a large expensive hunk-o-meat.
I followed this chef step recipe: https://www.chefsteps.com/activities/perfect-every-time-center-cut-tenderloin-roast
I strongly suggest pairing it with the demi-glaze sauce referenced within that recipe.