How would one train for a pft without a gym?

So I leave for basic in a month and I live in the middle of the country and there's no gym around me. I got a 50lb bag of sand I use to ruck and a 30lb medicine ball I use for weighted pushups and pull ups but I can't think of a good way to train for the deadlift or the sdc. I was thinking about buying a cheap sled from Walmart and tossing the weights on it but not sure if it'd hold up. I've been starting to do squats with the bag of sand in a backpack for quads though don't know how this would equate to a deadlift.