We give a cabling formula for the Links--Gould polynomial of knots colored with a 4n-dimensional irreducible representation of \mathrm{U}^H_q\mathfrak{sl}(2|1) and identify them with the V_n-polynomial of knots for n = 2. Using the cabling formula, we obtain genus bounds and a specialization to the Alexander polynomial for the colored Links--Gould polynomial that is independent of n, which implies corresponding properties of the V_n-polynomial for n = 2 conjectured in previous work of two of the authors, and extends the work done for n = 1. Combined with work of one of the authors arXiv:2409.03557, our genus bound for \mathrm{LG}^{(2)}=V_2 is sharp for all knots with up to 16 crossings.
