Current ThinkPads have working suspend out-of-the-box, including turning off or putting to sleep peripheral devices, waking on keypresses or lid opening, and otherwise handling suspend/resume exactly as expected.

Sadly, this is what I thought. Nobody wants to open their backpack to find a warm helicopter

I'd consider System76 in that case, I don't think their fit and finish is known for being top tier but the specs are pretty good. Also maybe framework? The thinkpads and dells are probably mostly fine, you can always return it if it doesn't work.