For taxes, submit tax return transcripts from IRS website. They're pretty short, typically no more than 3-4 pages.
For any evidence you submit - if you redact things or only provide partial document - it may result in RFE. With auto insurance policy - do you have policy cards showing both names? It may be shorter to show. What do you carry in your car to prove you're insured?
In general, the more evidence you can submit - the better it is for your case.