I had a 1986 Trooper II 2 door that I put more than 300k on. And I beat the living daylights out of that vehicle off road. It had a skid plate under it and I took advantage of it that’s for sure. The easiest truck in the world to drive too, but it had no top end on the highway that’s for sure.
It was identical to this one:
https://barnfinds.com/nicest-one-left-1986-isuzu-trooper-ls/
3,000 RPM @ 55MPH. Top end similar to the old British Leyland Land Rover or Toyota Land Cruiser of same 70’s vintage. Not your highway trip chariots.