What type of grease should I use on the "balljoints" (if they're called that, the big joints where ends of front axle meet inside hub of front wheel)?

Any lithium grease?

Some special sort of grease?

(This is a G-reg Fourtrak which is used mainly to tow a horse trailer so steady pull on the roads plus a big of parking/manouevring on grass at the end. Don't do water or offroading). Thanks,