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We can't drive into our garage - too steep

We bought a house and just moved in only to find we can't park either of our cars in the double garage because the angle is too steep and our cars too low! You cant drive forward or reverse in - Front bumper grinds to a full stop driving forwards, back exhaust scraps badly. Can you help solve this problem? We're not sure what to do, maybe get a big grate we can drive over? Ideas and quotes welcomed please. This is a priority for us to sort.