Robbie Knievel -- Arrested For DUI ... In a Motor Home

Robbie Knievel -- the daredevil son of Evel Knievel -- was arrested for DUI in South Dakota this week after cops say he went on a drunken rampage in his motor home, TMZ has learned.

We've confirmed ... the 51-year-old was arrested on Tuesday around 6:38 PM outside of the Buffalo Chip campground ... where lots of people stay for the famous Sturgis motorcycle rally.

According to law enforcement, Buffalo Chip security called police after witnesses say Knievel smashed into two other motor home units on the property, breaking a mirror and a bumper, and then tore out of the property without stopping.

A short time later, cops found Knievel's RV in a nearby parking lot with the motor running ... with Robbie texting in the driver's seat.

Cops say they detected a strong odor of alcohol -- and when asked, Robbie said he had 3 drinks earlier that evening.

According to cops, Robbie took a breath test and blew a .228 ... almost 3 times the legal limit in South Dakota.

He also bombed several other field sobriety tests -- including two counting tests.

Cops say Knievel was physically unable to do the 1-leg stand and the walk-and-turn test due to previous physical injuries ... after all, he is a daredevil.

Robbie was eventually hauled to a nearby jail -- where he was booked and eventually released.

And talk about quick justice -- Robbie was already sentenced for the crime: His license was suspended for 30 days and he's been ordered to pay nearly $600 in fines.