Welcome @peca, I don't have sensory neuropathy but do have small fiber peripheral neuropathy. I haven't seen any other members with sensory neuropathy who have posted about stiffness in the weight and trunk of the body but hopefully someone with experience can respond. From what I've read it sounds like you may be describing stiff-person syndrome. Mayo Clinic has some information here if you want to see if it's similar to what you are experiencing - https://newsnetwork.mayoclinic.org/discussion/what-is-stiff-person-syndrome/

Do you have other neuropathy symptoms as well as the stiffness?