You might want to try a search of the internet and visit some sites like
www.401khelpcenter.com.
I have never seen or heard of any connection between disability and rollovers. Rollovers are a form of distribution and distribution has nothing to do with medical conditions etc, but instead has to do with termination, whether of the plan or participation.
Under "Hardship Withdrawals" a "distribution" could be made for unreimbursed medical expenses subject to the terms of the particular plan. It is also usually subjected to the requirement that it be major or catastrophic and that no other loans are available.
Medical expenses might be caused by disability, but disability is not a medical expense.
Hardship withdrawals are loans not rollovers.