I built 2' x 4' carts with a trellis and wheels, pretty much like a mobile scrog. I start plants in the veg room and roll them to flower when ready. For trellis height, it varies from about 28" to as much as 40" that I use for sativa dominant plants.. the wheels allow me to do a 180 degree turn every couple of days to ensure even light distribution during flower. If you have the room, this works great!

Peace,

Farmer Rich