Mud is one of the worst things for your cruiser...It sounds like you have a failing alternator...Can you hear a swishing noise under the hood?L

w battery voltage will cause all this...All he mud and grime gets betwen the brushes in your alternator and it Will not charge your battery properly...This may be why all your dash lights are on.You will need to test the voltage on your alternator...The brake problem is the same...You have probably fiiled the brakes full of crud and they are not working because of the dirt and grime...You will have to remove the wheels and clean and inspect all four wheels...I have been 4 wheeling landcruisers for over 25 years and have had similar problems like yours..It,s all fun but it makes for alot more maintence to your truck...I try to avoid the deep mud ...