Trim Daddy Trellis System Support Kit - Model BTrellis System Support Kit (Model B) Looking for the perfect support system to help your plants reach their full potential? Trim Daddy's Trellis System Support Kits are designed with industry grade growing trays and two sets of extension poles, so you can provide protection every step of the way. Model B is compatible with industry standard ROUND corner trays. *NOTE: The only difference between Model A and Model B is that Model A fits square clamps