At our niece and nephew's shop (Pop + Dutch) in Provincetown (now closed for the season), they sell a house made pimento cheese. And they were happy to offer the recipe here:
So, this is a gigantic proportion, but:
5 lbs. sharp yellow cheddar, shredded in the food pro
2lbs. roasted red peppers, diced
3.5 cups mayo
½ Tbsp. cayenne
½ Tbsp. Tabasco
I'm pretty sure the mayo is Duke's, too.