Alternative to 4wd

[fourthclassC]

Howdy, has any one installed a rear locker on their differential? I have a 02 Ford E350 with V10 and would like to install an electric locker to help free the vehicle when stuck in mud, wet grass, snow....... I have found that being such a heavy vehicle is no help in some situations. 4wd conversion I.E. Quigly.. is too expensive and would not be necessary. From driving a pick up with rear locker, I think that is the answer for me. Any product recommendations?
Thank you

[Gdetrailer]

I buy and own nothing but 2wd F250s, older ones made sure they were optioned with limited slip, new ones with Electronic Locking axles as Ford n longer offers Limited slip in pickups.

The factory Electronic locking axle is somewhat of an improvement over open or limited slip.

Does not and will not replace 4x4.

In other words, you still can get stuck on wet grass and mud if not careful.