That was a great thought you had. On my 2005 in the inside corners of the bed there were black tie down loops. Are they there in your 08? As you know I downsized back to a Frontier and the loops were stopped this year and they cost me $9 each plus the bolts. Had I used your creative thinking I'd have taken them out of the old truck and transferred them to the new truck.
The Frontier is still a nice truck but she's no Titan. It's amazing how all the Nissans use the same oil filter. The best part so far is on a recent highway trip I got 22.8 miles per gallon. Hope you're enjoying the new truck, may she serve you well.