If you have some wood around, you might make new ones that are as high and wide as you need. Just make sure they will fit under. My older metal ramps wouldn't fit under newer cars. I made wood ones that would. Ramps that work with newer cars often do not lift things very high.
If you are going to have to buy wood, maybe you may as well buy ramps. Search here, and you will find many positive posts on the Rinos. also descriptions of home made ones. If recycled is important to you, as it should be to all of us, try the EZ-Rizer. Let us know how they work. Storage shouldn't be a big deal, wherever you have room. cold temperature shouldn't hurt them.
If you are going to have to buy wood, maybe you may as well buy ramps. Search here, and you will find many positive posts on the Rinos. also descriptions of home made ones. If recycled is important to you, as it should be to all of us, try the EZ-Rizer. Let us know how they work. Storage shouldn't be a big deal, wherever you have room. cold temperature shouldn't hurt them.