Thought I would share the fall sales have netted me a couple much reduced, patio furniture, table covers! I will be using them as carriage covers. Heavy plastic, might have zipper for snug fit on tables. Elastic edges seem to help keep them down. They do shed heavy rainfall, though they get stiff in the cold. Bigger sizes really cover everything! These have long sides, come down a good distance from the top section.
With some of us starting to winterize, these work nicely for long term storage in the cold months. With my center aisle barn, prevailing west wind blowing thru, I get lots of dirt on things. Covers help a lot!
Other folks like car covers. Depending on what kind, they can be water resistant, plenty big to cover part of the carriage and wheels. They can be billowy, catch the wind and ripple. Water resistant may not mean waterproof, should they get wet for a long time.
Also helps keep the cats from sitting on the carriages much, though mine might get under the elastic and lay on the floors. Cats are not tracking dirt all over the seats. These covers in smaller sizes might also be helpful in covering small machines there is no barn room for, like an ATV. Better than hopping on a wet seat! Ha ha
Just an idea for you to think about.