Rovers, especially when used on low gravity planets, can flip easily. To prevent this from destroying you rover, build a roll cage out of landing gear. This can be stowed away when not airborne and will save your rover.
@exbyde I have fixed the F-19-D and updated the KerbalX page. Rerooting to the fuel tank fixed the problem. https://kerbalx.com/kittenshark134/F-19-D-Sparrowdart
Here's a fighter I made that recently fought in (and won an episode of) Tape's Fighter Jet Showdown.
https://kerbalx.com/kittenshark134/F-19-D-Sparrowdart
Here's my fighter:
https://kerbalx.com/kittenshark134/F-7-Broadhead
It has 4 ECM jammers in the fuselage, feel free to remove some if this is too many. Also, sorry for incomplete KerbalX page, I will add some pictures later.
Here's my stock (hands-off!) guided missile.
https://kerbalx.com/crafts/33322/edit
Air-to-air or air-to-ground, full write-up is on the KerbalX page. It can hit targets using only SAS target lock.