There is a great Dell resource that covers configuring stateless boot using the Dell customized VMware ESXi 5. It basically covers how to create a zipped file of the Dell customized image and use it with VMware Auto Deploy.
Per VMware policy, Dell is not allowed to provide the zipped version of the Dell customized image. But customers can create one using the instructions provided in the Dell whitepaper linked on this wiki article:
The direct URL to whitepaper is here:
The pages of interest are pages 4-6. It provides step-by-step details on creating an offline image depot for VMware Auto Deploy. Lastly, this Dell whitepaper was tested by and is a supported config per the Dell Hypervisor Enablement team.