Looking for a big kid bed

We’re planing to transition our kiddo to a twin size bed in the next year or so - currently in a toddler bed, but it feels like it’ll be outgrown fairly soon. We’re limited on space, so we’d like something that can eventually be lofted, but we want it to be normal height for safety/ease for at least several years. I’m thinking something like dorm beds where the head and foot boards have notches and you can select the height of the horizontal piece, but so far no luck finding anything similar online… Does anyone have any suggestions or where to look?