I'd like to echo what Dave said. Pick what you want to do on that day and it do it. An idea would be to alternate one day going for higher repetitions and one day going for lower reps. Or even a 2 week heavy and 2 week not as heavy, there are tons of way to skin a cat here.
I'm curious as to why you want to work endurance with the deadlift? Is it for cycling specifically?
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."