Corrosion X is your friend.

https://www.zoro.com/corrosionx-corrosi ... lsrc=aw.ds

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2005 KJ CRD 2.8L Liberty Ltd.

151K mi. 04/19
F37 w/no shudder
2nd gen filter head
SAMCO Silicone Turbo Hoses
Airtex E7181M Lift pump/Sasquatch plug-and-play harness
https://shop.sasquatchparts.com/
MANN ProVent 200
Weeks stage 1&2
GDE ECO Tune by Green Diesel Engineering
OME 2" lift/Bilstein shocks
IRO rear UCA w/WWDiesel Bracket

My jeeps body is nearly spotless and spent most of its life in the northeast. Not sure how the bottom got so messed up on the one you looked at. My axles and stuff have rust on em but so does my 1 year old F150.

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2006 CRD - GTB2056 turbo by Dieselguy86, Eco Trans Tune, Lift Pump, Week's, HDS Tstat, Racor Filter, ARP's, OME 790's+Top Plate, JBA 2.5", JBA UCA, Moab's+265/75R16, ARB Bull Bar, 4.10's, TrueTracs

I would think that the question of applying more protection for the vehicle depends on how long you intend on keeping it and how much you personally like it. If its already super clean underneath and you intend on keeping it I would definitely invest a bit into improving the protection.

I think they are great little vehicles.. once you undo the bean counter engineering and perform the required maintenance, but if you cant handle the fickle Italian mistress and intend on moving on it might not be worth your time.

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05 CRD Limited GDE Hot Tune, EuroTC, ARPs, Full EGR Del, IDParts Hoses, Etecno 7v GP, OME 790 Bilstein 916front, OME948 OME N132Lrear, JBA A-Arms, 245/75/16 Duratracs+Moabs, Renegade roof lights, Curt Front Hitch, BTF Kryptonite Diff, JCR Stage2 Rails, SkidRow Skids, HDS Tstat,

Sold 06 CRD Limited K&N, EHM, ORM, EuroTC, TransgoKit, Samcos