My '04 Komfort 25FSG had factory shocks. They did help a bit, but because the angle they were installed at, I don't think they were as effective as they could have been. In retrospect, I should have done an axle flip as soon as it was out of warranty and I think they would have worked much better. I can certainly tell that my current KZ does not have them.
Were I in your shoes, I'd spend the money to replace them, especially if the rig's in otherwise good condition and you tow it a lot.
Lyle
2022 GMC Sierra 3500 HD Denali Crew Cab 4x4 Duramax
B&W OEM Companion & Gooseneck Kit
2017 KZ Durango 1500 D277RLT
1936 John Deere Model A
International Flying Farmers 64 Year Member