GM kept the kingpin 60 up until 91 in the crew cab 4x4's and I've seen a very small amount of regular cab 88's that were the 73-87 bodystyle yet. 88 was the start of the GMT400 bodystyle so all K30's in 87 will have a KP60. Only thing I'd be leary of is how they did the steering with the lift, if you're wanting reliable and strong steering offroad look into crossover steering and possibly hydro assist. If they kept the factory push-pull type steering I'd change it out soon after buying. To me 10" would be a little top heavy with the camper in the back but its all up to you. The 6.2 will work good for what you're wanting to do with it.
2006 RCLB LLY, PPE airbox mod, Diamond eye 4" straight pipe 5" tip, custom CAT fuel filter/factory filterbase delete, pcv re-route, recon clearance lights, tow mirrors, blue LED's in dash, raptor lift pump(Fass 150 soon), Glowshift gauges in autometer overhead pod, Slow budget build
1995 F250 7.3 PSD 5 speed, 4.10's, limited slip rear, 35's, service body. The farm service truck/weekend beater SOLD
1981 Toyota 4x4, conversion to '95 22RE in the works.