I went to one of the first mud bogs in Juniper, GA back in the day. It is amazing to see how far it has come. There are some seriously awesomely built machines out there.
Just about anything that will make enough power. A lot of big block stuff LSX is popular too. Prochargers, turbos, and yes nitrous too as power adders. Me personally it would be either BBC or turbo LS.
I grew up in South Georgia. I live 45 mins from Taylor county boon docks. But will never understand how anyone like to watch a truck just go threw the mud. I like monster jam and anything with a motor but honestly mud bogging seeMs so boring. But hey what ever floats your boat. Or sinks your truck 🤷🏽