'Bumpy' depends on your experience prior to owing a Hilux. If you don't have much load most times, then just change absorbers. I changed my rears to Rancho 9000XL (adjustable) and it rides well on minimum load, now thinking of Bilstein for front cos want to lift a bit.

You see, every truck is 'purpose-built' and 'market-driven'. The Hilux was designed as a carrier with the ability to penetrate the world's toughest terrains. That's why they are high and firm. On the other hand, Tritons and Rangers are for ladies who ferry their grandma to Tesco every weekend. That's why they are lower and softer.