This bed gives you the largest available surface area if configured in the 7.5' x 4.5' configuration. However, you will need to purchase the 4.5' brace bars separately should you want that configuration. There was a wait for the braces so we opted to just go with the 8' x 4' configuration which gives you the 2nd largest possible surface area for gardening. We bought 6 of these, built them as the 8' x 4', and used the VAT55 Curved Trellis to join 2 pair sets. Couldn't be happier with Vego!!