The preferred route from Leadville to SBS with a big rig would be hwy 9 north from Silverthorne to Kremmling and picking up hwy 40 over Rabbit Ears Pass to SBS.
131 may be doable but its a narrow winding road thru the middle of no where with no services. during the 12 yrs I lived in SBS I only used 131 to get to the Colorado River for kayaking.