The 14th St Crew here in Phoenix has several Monteros and a Power Ram 50 (Mighty Max 4WD), and all but one of them has Gas-A-Just shocks on. That's our vote, whether tire size is stock or up to 35". The 99 has MonoMax shocks, and on the drive home from San Diego last year, the two of us who took turns driving it noted that the ride on the freeway was uncomfortably stiff. My personal impression was unfavorable. The G-A-J shocks are an improvement over stock, in my opinion, and the MM are over the top, pretty harsh, but that's just me. Yes, I'd like to try the Bilstein shocks, but the price is a good deal more.
John B.