well (set_beam_defaults 9000000, 1250, 348000, 668000) is wot i used on that truck but is weak as i wanted the truck to fail, i use the ror wiki to try and understand the braekable strengh of beams but as said by many the trucks become unreliable in the fact that they seem nice and strong and fall apart with harsh driving but some times they just flip an axle on the first hit, i'll keep playing with it but unless you know where all the nodes are its hard not to lose hole axles when really i just want to bend a 4link and pitch out the drive shaft or front/rear steering hope the setting help as a start point