I think most gyms don’t have sleds/prowlers, but you can always do loaded carries:
Grab two heavy ass dumbbells and walk around with em
Bearhug a plate or two and walk around with them
If you have a loading pin, put plates on that and walk around with it.
You can also do KB swings for cardio/conditioning, or swing a dumbbell if you don’t have access to kettlebells.
Maybe try these things for cardio too:
Either dumbells or straight sets of 45. I’d prefer to do straight sets of 45, and add weight over time. No rush.