@VWbaja10 The weight of an Explorer will squish a R5000 into crab salad. Not sure how, but I managed to bend one of mine, back when I had 'em. I mean, it was better than the worn-out stock ones, but definitely not ideal for these vehicles.
I've found the Superlift gas shocks to do well on mine (they came with the kit) but most of the 4"+ crowd on here will say Fox shocks are a good pick. Can't speak for those myself, though. There's some other brand that people like on here but I can't remember what it was called, for some reason.
Personally, I would recommend a gas shock absorber over a hydraulic one, for these trucks. Just personal preference. They seem to level faster after taking an impact, since they have their own "push" resistance, and they (regardless of what some know-it-alls will tell you) DO help to support the weight of the vehicle. I don't know about longevity, though.