We took a brief glance at the ridiculously quick Palmer Designs GMC Motorhome in our big, salty photo gallery from Bonneville Speed Week, and this thing is full of such great racing madness that we're coming back for a closer look.

By RV standards, this is pretty aerodynamic. Murilee Martin

General Motors built its innovative front-wheel-drive motorhome for the 1973 through 1978 model years, and these Oldsmobile Toronado drivetrain-equipped RVs still have a very devoted following to this day. The GMC Motorhome is quite slippery compared to the other full-sized RVs at your typical campground, but that doesn't meant that beating the current holder of the "World's Fastest Motorhome" title in the Guinness Book of World Records is going to be easy.

With a 502-cubic-inch Chevy V8 driving the front wheels, acceleration must be gentle Murilee Martin

The current speed record for motorhomes is 137.9 mph, held by a Mercedes-Benz Westfalia Viano. Now, some might complain (rightly, we think) that a Sprinter-based RV is too cramped and van-like to be considered a real motorhome, and so the Palmer Designs guys are shooting for the 128.6 mph record held by a Hymer AG motorhome… and the Sprinter's record as well.

Six wheels, 502 cubic inches Murilee Martin

Retaining the Toronado-correct TH-425 automatic transmission (which drives the front wheels via an ingenious chain-drive system), the Palmer Designs crew replaced the smog-era Olds 455 engine with a built-up 502-cubic-inch Chevy V8. You can read up on the many modifications on their website.

The BLM police insist that all vehicles have headlights at night Murilee Martin

The Autoweek campsite at the notorious Bend In The Road happened to be right next to the Palmer Designs guys' campsite, and so we had the opportunity to watch them get hassled by the BLM police for riding their very sensible beer-cooler-based pit vehicle without headlights. If you're going to try to drive a motorhome at 138 mph, you're not going to be too obsessed with minor details such as safety equipment for your motorized beer cooler.

Going for the record again Murilee Martin

Crosswinds held the GMC back a bit, but the team managed to get a respectable 120.838 mph during Speed Week 2013.

You can see this thing from a long, long way on the salt Murilee Martin

Just 7.78 mph short of the real motorhome record, and 17.062 mph away from the asterisk-slugged Sprinter record. So close that slightly more favorable salt conditions and a bit less wind might do the trick!

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