if you have good rubber bump stops and come down hard you should not bend an axle tube. I have progressive urethane
bump stops fr and rear. If you do slow wheelin' I really don't think you need a truss. If you go 40 mph thru the desert and hit a wash out, come down hard, loaded with 1000
lbs of fuel/cargo, then I'd say go for it. The only bent axle we have had was on a 12 bolt rear, when Walter came down hard, loaded, at 30 mph, with rotted bumpstops.
SteveB