I know this is an older thread, but just wanted to add in case anyone is considering this

we have an egle cube for our ducks and couldnt love it more. We have the 13 ft run and its very mobile which is nice. Moved it once or twice a week all summer on the grass and very little cleanup in the pen needed. The house cleans up super easy, and everyone says the height wouldnt work for ducks, but I found a ramp made for dogs to get into a car with and it fits on perfectly, very stable, and our ducks have no issues using it at all. Havent gone through a winter yet so that may change things if the ramp is tough for them in winter, we are preparing some alternatives in case. But so far its been a dream.
We also have the eglu mobile fencing so they can free range during the day, with a bird netting stretched above as a hawk deterrent. We did have a fox attack the first and only time we were unable put them to bed on time, which was heartbreaking. They were just in the mobile fencing, which is not predator proof at all. Ive never left them overnight in the pen, didnt want to risk it, and they seem comfy in the house. Have had up to 4 Welsh Harlequins in the large cube no problem. I DO have to escort them into every night, they wont go up yo bed on thrir own like chickens will (we hear, have no chickens) but we have the auto door so they come down/out into their pen in the morning, so we only have to put them up at night. They are beloved pets to us so we dont mind. Just get a doggie ramp. I'll post the one I use.
MaxWorks 50524 61" Portable Folding Pet Ramp, Black
https://a.co/d/8nkfp9J