Charles Spurgeon Commentary 2 Samuel 7:6

"for I have not dwelt in a house since the day that I brought up the children of Israel out of Egypt, even to this day, but have walked in a tent and in a tabernacle." — 2 Samuel 7:6 (ASV)

A structure to be set up, and taken down, and to be moved about wherever the people journeyed. That was sufficient to be a central shrine of worship, and God cared for nothing else.