I purchased a Lund SSV-18 in 2006. I did extensive customization shortly after purchase. This link shows the extent of that customization: https://correllconcepts.com/boat_conversion.htm . It involved numerous screw and bolt fasteners. All were stainless steel. To the best of my knowledge, there has been no corrosion of any SS fasteners I installed. Also, all the fasteners on the original hull are also stainless steel. It's doubtful that Lund would use fasteners that would corrode with the aluminum.
Further, here's a quote from the Lund Owner's Manual that came with the boat: "Due to the electrolytic action between dissimilar metals, all fittings and fasteners attached to an aluminum hull should be aluminum or stainless steel. The use of nickel, brass or ferrous fittings and fasteners may result in aluminum corrosion if the fitting or fastener contacts the aluminum."
Further, here's a quote from the Lund Owner's Manual that came with the boat: "Due to the electrolytic action between dissimilar metals, all fittings and fasteners attached to an aluminum hull should be aluminum or stainless steel. The use of nickel, brass or ferrous fittings and fasteners may result in aluminum corrosion if the fitting or fastener contacts the aluminum."