My 25.2 is 2017 and this won't answer your question but I can't measure it as my Axis is still being held for ransom by CW. If not released by Oct 10 I have a plan to rescue it for our Smokey Mtn trip on the 15th.
My Weber Q 120 grill will not fit in the rear storage compartment or any other compartment. It is toad friendly only. So far the only chairs that fit are the collapsible bagged type. A bigger concern to me than the size is the usable space. The slide controller is located on the back wall of the compartment and I hesitate to locate anything too large that might come in contact and damage it. For that reason a milk crate with power cables is max height in the compartment. YMMV.
Dennis and Pam
2017 Axis 25.2
Toad - 2004 Honda CR-V