O. J. Simpson (double murderer) seems to have adequately protected his NFL and other retirement plans.
The very first layer of protection is insurance. Insurance companies fight really hard when they have a lot on the line. That's why we carry (IIRC) $100K/$300K on the cars and houses and a $2MM umbrella policy.
You also want to maintain a good balance between your REI and other investments. I've generally tried to keep my RE below 35%-40% of my total asset package. And just like with your mutual funds make sure that you're not too heavily into " growth" property versus " income" property.
Alway make sure you lots of ready cash available to take advantage of ever changing economic conditions. That cash needs to be in non-retirement accounts.
all cash