So on a lot of the rental trailers they have straps that fold over the front tires and you cinch them down on a ratchet that is welded to the front of the trailer on each side where the tire stop is. You can see the netting on the front tire in that picture. There is a chain located on the middle of the trailer that you attach as a safety. It's not going anywhere unless you plan on going offroading with your towrig
Budget truck rental has the same exact trailers with the front wheel straps, as do the two wheel car towing dollys that uhaul has. Seems I've used every type at some point or another. Yeah not surprised on the Penske trailer, forgot about that. But try Budget as well, I used one of their trailers behind a Penske truck before
I pulled that when I lived in Valencia, pretty close to you, but maybe the budget franchisee wanted the rental bad enough to move the trailer since it was one-way