What is the best body plan to allow for giant size in a terrestrial animal?

My question is rather simple; assuming optimal atmospheric and planetary conditions, what body plan would be able to support the largest plausible land animal?

To split the above question into a multitude of simpler ones, I could ask "How many legs would said animal have, what size and shape would they be, and how would they attach to the body? Would it have legs at all?" Similar questions could be asked about other body parts.

To clarify a bit more, I'd like this animal to be A) a heterotroph, and B) mobile - so no sessile organisms please.

If you require any further elaboration, deem the question in need of improvement, or have a question, please do not refrain from commenting. Also, it would be much appreciated if you didn't downvote without saying anything about why you did as such.

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What is the best body plan to allow for giant size in a terrestrial animal?

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