Whether it was a matter of Memorial Day sales events and related incentives, or improved consumer sentiment, pickup sales were generally up considerably from both May 2011, and April 2012. Unsurprisingly, the top three spots remain unchanged, with the Ford F-Series once again leading, followed by Silverado and Ram. And just like last month, the combined sales of the Silverado and Sierra still couldn't unseat Ford from its number one perch.

Further down the list however, things are a little different. Whereas the Ford Ranger out-sold the Nissan Titan last month, the two switched places for May, with the Titan out-selling the Ranger by more than 550 units. Although we're still holding out hope for a change of heart in Dearborn to bring the outstanding foreign-market T6 Ranger to the U.S., the company seems solidly committed to the F-150 as the right entry-level truck solution for American buyers.

1. Ford F-Series -- 54,836, Up 29.3 Percent
Tell me if you've heard this before… The Ford F-Series remained on top once again, easily out-numbering the combined sales of the Chevrolet Silverado and GMC Sierra, and selling more than double the number of Ram trucks, again. Not only did the F-Series improve its year-over-year May performance, it topped April's numbers by more than 7000 units. Although impressive, May's performance still couldn't match that of March, with 58,061 trucks sold.

2. Chevrolet Silverado -- 34,555, Up 21.6 Percent
The Silverado showed a solid double-digit percentage gain for May 2012, and improved on April 2012 sales by more than 3800 units, but like the F-Series, fell short of the spectacular March numbers by 1936 units. An all-new model is coming soon, and should fare better against Ford once it hits showrooms.

3. Ram 1500, 2500, 3500 -- 26,040, Up 29 Percent
Ram repeated its double-digit year-over-year performance for May, as well as improving upon its April performance by just less than 5000 units, and falling just barely short of March 2012 by a scant 920 units. A significantly-updated 2013 Ram 1500 model is on the way, and if Chrysler's 2012 fortunes are any indication, it could increase Ram's market share considerably.

4. GMC Sierra -- 13,196, Up 22.7 Percent
The Sierra holds the fourth-place spot once again, posting a solid double-digit year-over-year gain, as well as improving on April 2012's numbers by just shy of 600 units. But like the rest of the pickup leaders, May Sierra sales couldn't quite match March's total of 13,849.

5. Toyota Tacoma -- 12,296, Up 24.6 Percent
After April's tepid 3.7 percent year-over-year increase, the Tacoma's 24.6 percent gain for May is welcome news. It also improves over its April numbers by 1395 units. Its May totals came only 251 units short of March's total of 12,547.

6. Toyota Tundra -- 8765, Up 103.5 Percent
Although still no threat to the Detroit Three's fullsize pickup hegemony, the Tundra more than doubled its May 2011 sales total of 4307. It also improved upon its April total by more than 1500 units. The May sales total even surpassed its strong March showing of 8594 units, making it one of the few trucks on this list to achieve that distinction.

7. Nissan Frontier – 5480, Up 17.2 Percent
The Frontier was up more than 17 percent year-over-year, as well as being more than 1300 units ahead of its April 2012 performance. But it still fell well short of March's strong performance of 6087 by more than 600 units.

8. Chevrolet Colorado -- 3778, Up 28.3 Percent
The Colorado's May performance posted a solid year-over-year May gain, and topped April's total by 279 units. Also, like the Tundra, it also surpassed March sales by 126 units. May's sales total is the best of calendar 2012 for the Colorado.

9. Nissan Titan -- 2166, Up 86.7 Percent
It may be one of the most dated entries in the fullsize segment, and among pickups in general, but its percentage gain for May is certainly reason for popping open a Bud Light in Nashville, if not the Moet Chandon. It topped April's total by just shy of 600 units, which considering the Titan's modest sales volume to begin with, is a big accomplishment. A lot of May's performance is likely attributable to the generous incentives that were offered on the Titan through the end of the month.

10. Ford Ranger -- 1607, Down 71.9 Percent
The aging U.S.-market Ranger continues to fade into obscurity, with numbers down nearly 72 percent from May 2011. It was also below April's total of 1990 units by quite a bit, and less than half of March's total of 4404. Ford can no longer brag about the Ranger out-selling the newer Colorado, although the Ranger's total for the month is still nearly double that of the GMC Canyon, and more than eight times that of the nearly-forgotten Suzuki Equator.

11. Honda Ridgeline -- 1199, Up 64.7 Percent
The Ridgeline posted a solid year-over-year gain for May of almost 65 percent, and topped April's numbers by 144 units. Of all the trucks here, the Ridgeline came closest to matching its March total by coming just 16 units short.

12. GMC Canyon -- 910, Up 60.8 Percent
Oh-so-close to breaking the four-digit barrier, the Canyon came just 90 units short for May. But like the Titan and other low-volume models, just a few units can make a big percentage difference. It's performance was up more than 60 percent year-over-year, and more than 120 units over April. It came just 31 units short of matching March's sales of 941 trucks.

13. Suzuki Equator -- 186, Up 7 Percent
Poor Equator. The best truck nobody knows about. A near-clone to the Nissan Frontier, but with a better warranty, the Equator improved on its April total by 35 units, as well as posting a 7 percent year-over-year increase for May. With Suzuki's automotive future in the U.S. uncertain right now, to say the best, now would be a good time to look at this handsome, capable midsize truck, if you're in the market.