yes extend it. your mattress will sag over time, and you might sit on the end and fall... I did the same to mine, put regular queen. I bought two pieces plywood and cut to fit new total size. for the extra length I cut another piece of plywood same thickness as factory one for under side to even thins out. then I took some 1x4 pieces and screwed them on the end for added support and to join the added length section, glued and screwed everything. lastly due to added weight I installed two lift shocks. works like charm, and way more sturdy than factory. I even added vertical supports under frame.
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