Question: Petersen's 4-Wheel & Off-Road began as a publication that is now released how often?

Context paragraphs:
1:10 radio-controlled off-road buggy: The 1:10 radio-controlled off-road buggy is a 1:10 scale radio-controlled dune buggy designed for off-road racing.  These cars are originally based on their full-scale equivalents that are commonly found in desert racing.  The buggies are split into two race categories, two (2WD) and four-wheel drive (4WD).  These can easily be distinguished visually by their wheel size at the front.  Cars are typically electric powered, but nitro versions do exist but are less common because racing classes exist for electric cars.  The class is inexpensive and similar to a number of other classes, and this makes them popular with newcomers.  The cars are also known as 1/10 off-road.

Petersen Rock Garden: Petersen Rock Garden, formerly Petersen's Rock Garden and also known as the Petersen Rock Gardens, is a rock garden and museum on 4 acre , located between the cities of Bend and Redmond in Deschutes County, Oregon, United States.  Rasmus Petersen, a Danish immigrant who settled in Central Oregon in the early 1900s, began constructing the garden in 1935 using rocks he found within an 85 mi radius of his family home.  Petersen constructed detailed miniature castles, churches and other small buildings and monuments from a variety of rock types.  He incorporated other design elements such as bridges, water features and natural landscaping.  Petersen worked on the garden until his death in 1952; the garden has remained in his family's care since then.  The garden, considered a roadside attraction with novelty architecture, includes roaming peafowl and a museum with a gift shop that sells rocks.

Shutterspeed: Shutterspeed was an independent rock band from Australia, led by frontman Andrew Petersen, which has released two albums and several singles and EPs.  The band enjoyed some radio airplay, especially the 'Good Little Monkey' single, but it was their live performances which established their reputation.  Shutterspeed shows were passionate, energetic and unpredictable, with the band creating exciting soul-infused rock; they often played long sets, throwing impromptu snippets of cover versions into their own songs.  The classic lineup, circa the 'Custom Made Hit Parade' album, toured New Zealand in late 2003.  By mid-2004 the band had split, with guitarist Anthony Dettori and keyboardist Morgan Wilson forming The Newtown Jets and bass guitarist Dan Alder joining Shifter.  Petersen, with drummer Scott Lapthorne and new bass player Matt Kafoa, continued as a three-piece Shutterspeed, recording the 'Turn to Black' EP.  Petersen and Kafoa relocated to the UK in mid-2005, playing as My Scarlet Darling with drummer Darren Lee and, following Kafoa's departure, bassist Wayne Myers.  In late 2006 Andrew Petersen returned to Australia and in 2009 released a solo album "The Universe And Its Sense Of Humour".

Mischief Brew: Mischief Brew was an American band from Philadelphia, Pennsylvania, United States, which played DIY anarcho-punk music, incorporating a variety of styles including American folk, swing, and Gypsy-punk.  It was started by Erik Petersen as a solo project, but eventually grew into a band.  Petersen drew inspiration from the protest movements of the 1960s, "the idea that rebellion in music didn't originate in punk rock" (Profane Existence No. 54, 2007), and anti-establishment artists like Woody Guthrie and Crass.  Petersen's lyrics often pay homage to American labor radicalism of the early 20th century.  Mischief Brew has released albums and EPs on many different labels, notably Art of the Underground, Gunner Records, and Fistolo Records.  In support of these records, Mischief Brew has toured extensively throughout the United States and Europe.  When playing live, they have performed with four to five people, incorporating such instruments as junk/found percussion, trumpet, accordion, violin, mandolin, and vibraphone into their set.

Hot Rod (magazine): Hot Rod is a monthly American car magazine devoted to hot rodding, drag racing, and muscle cars — modifying automobiles for performance and appearance.

Trucks and Tractor Power: Trucks and Tractor Power was a long running weekly television show on TNN featuring mud bogging, tractor pulling and monster trucks.  The show's original hosts were Stan Rhoads and former Bigfoot driver Rich Hooser, along with pit reporter Mike Goss.  Gary Lee replaced Stan Rhoads.  Army Armstrong later joined as a pit reporter, and later, when Hooser left the show, became color commentator.  The show initially began in 1989 as a vehicle for TNT Motorsports events, complimenting their ESPN show Powertrax and syndicated show Tuff Trax, and would typically alternate between truck and tractor pulls and monster trucks, with National Mud Racing Organization mud races intermittently.  After TNT was bought out by the United States Hot Rod Association in 1991, the show began primarily airing the Pendaliner Monster Truck Series and NMRO mud races held at Special Events' 4-Wheel and Off-Road Jamborees.  A frequent feature of these shows was a highlight segment of "Tough Truck" amateur off-road races near the end of the monster truck episodes.  The final season of Trucks and Tractor Power had Gary Lee as the host at the Monster Truck Thunder Drags, with Dave Rief, and later Tom Rivers, for the Jamborees.  At the end of the 1996 season, the Pendaliner cancelled their sponsorship of the monster truck series, causing the show to be subsequently cancelled.

Ricky Johnson: Rick Johnson (born July 6, 1964) is an American former professional motorcycle, off-road truck and stock car racer.  He competed in AMA motocross and Supercross during the 1980s and, won seven AMA national championships.  He later switched to off-road racing.  In 2010, he won the Pro 2WD Trophy Truck championship in the Traxxas TORC Series.  In September 2012, he won the 4x4 world championship race at Crandon International Off-Road Raceway and later that day won the AMSOIL Cup pitting the two and four wheel drive trucks.  Johnson won the 2014 Frozen Rush, the first short-course off-road race on snow.

Carl Renezeder: Carl Renezeder (born April 16, 1964) is an American off-road racer for Team Renezeder Racing.  As of the end of the 2016 season, Renezeder has won 121 short course national events he has competed in Lucas Oil Off Road Racing (LOORR), Championship Off-Road Racing (CORR), and World Series of Off Road Racing (WSORR).  He has won nine short course off-road racing championships.  Renezeder was also the first driver in short-course off-road racing history to win championships in both two wheel drive and four wheel drive trophy trucks in the same season when he won the 2009 Unlimited 2 and Unlimited 4 divisions in LOORRS.

Petersen's 4-Wheel &amp; Off-Road: Petersen's 4-Wheel & Off-Road is a magazine dedicated to 4x4 and off-road trucks and SUVs.  The first issue was published in 1977; it began as a special-interest publication from the editors of Hot Rod magazine.  "4-Wheel & Off-Road" covers a range of topics for the do-it-yourself light-truck enthusiast, including real-world 4x4 performance modifications, new products and product evaluations, off-road event coverage, new-vehicle evaluations, travel, and lifestyle.  In March 1978, the magazine officially became a monthly publication, and in 2013, "4-Wheel & Off-Road" celebrated its 35th anniversary.

Spare wheel cover: A spare wheel cover or spare tire cover is an accessory that covers the spare wheel mounted on external part of a car or van.  On 4x4 vehicles the spare wheel is normally rear mounted and is often printed with a dealer's name or something more fun.  Covers can be hard shells or soft vinyl covers.  Spare wheel cover protects spare tires from the dirt and the sun's harmful UV rays in areas with many days of sunshine.  Spare wheel covers need to be removed once in a while and cleaned.

Supporting paragraphs: Petersen's 4-Wheel &amp; Off-Road Hot Rod (magazine)
Answer: monthly