Lowes- help with loading large items

I use the service of Lowe's for a lot of home projects and also refer new home purchasers to Lowe's for their needs. I always have problems (both in Cookeville, Tn and McMinnville, Tn) with finding associates to help with gathering materials and loading them. Are they supposed to help load large items after they have been purchased? or is the customer responsible for loading the items/materials?