Owned one. 60k miles of driving with no engine or trans issues. you will go 10 mph up steep hills. exhaust brake will stop you on a 12% grade. harsh ride even with suspension mods. never flush the jatco transmission - sometimes kills them. isuzu parts available at gm dealers. 12 mpg towing our toyota echo. do not add propane injection - acceot the slowness. we did 12 mph for 1.5 hours once going up the mountains - stopped once to let the trans cool. add trans temp, tach and pyrometer gauges and use them!
Matt b