Does a 1x3 Lego technic liftarm with two round holes and one axle socket exist? (for tank suspension usage)
I can't see a lift arm with two round holes and one axle hole on the same plane, but there is one where the holes are perpendicular



https://www.bricklink.com/v2/catalog/catalogitem.page?P=42003

If you have the space you could try joining a standard 3L arm to one of these



https://www.bricklink.com/v2/catalog/catalogitem.page?P=60483

Updated suggestion
Now that I see what you're trying to do, have you considered one of these

https://www.bricklink.com/v2/catalog/catalogitem.page?P=32449

It's 4L but the extra axle hole would be concealed by the wheel, and the wheel would have it's axle through a pin hole and spin freely.