The big news in March was Ram's toppling of the Chevrolet Silverado from its traditional Second Place spot on the sales chart. The Silverado is back in the number-two spot for April, by a margin of around 6,000 units. Further down the list, the GMC Sierra and Toyota Tundra both see year-over-year April gains of more than 20 percent.

The outgoing Chevrolet Colorado and GMC Canyon continue to dwindle down to absolute zero, as both dealers and truck enthusiasts eagerly anticipate the availability of the 2015 models.

Ford F-Series - 63,387, Up 7.4 Percent
The F-Series retains its commanding sales leadership in April, as it has for the better part of the last three decades. Ford's Dearborn truck plant is gearing up to produce the aluminum-bodied 2015 F-150, one of the most significant changes to this bread-and-butter model since its introduction.

Chevrolet Silverado - 42,755, Up 8.5 Percent
Ram may have had an upset victory over the Silverado in March, but Chevy came back in April, up 8.5 percent. Some dealers have complained that GM has not been as generous with incentives and special offers to keep sales up, but the lower-volume, higher-margin strategy seems to be paying off for GM, which is performing strongly in the over-$40,000 segment of fullsize trucks.

Ram 1500/2500/3500 – 36,674, Up 17 Percent
Ram is back down to its traditional third-place spot again in April, but there's no doubt that its strong performance in March got the attention of the industry and of General Motors. So far, there's been strong initial demand for the Ram 1500 EcoDiesel, at least from dealers, but it remains to be seen if this unique powertrain option will have the staying power the Ford EcoBoost has in the F-150.

GMC Sierra – 17,246, Up 21.4 Percent
GM's focus on higher-trim trucks has been a boon for the GMC Sierra, which has the popular and profitable Denali trim. Year-over-year April Sierra sales were up a strong 21.4 percent.

Toyota Tacoma – 13,871, Up 6.9 Percent
With little competition aside from the Nissan Frontier, the Tacoma still dominates the midsize market, at least until the 2015 Chevrolet Colorado and GMC Canyon enter the scene, which promises to be formidable competitors to the Tacoma and to likely upset the current midsize truck oligopoly.

Toyota Tundra – 10,217, Up 23.5 Percent
In absolute terms, the Toyota Tundra is somewhat of a big player in the fullsize market, but it has been enjoying a good run lately, with several months of five-figure sales. The 2014 model refresh brought some changes to exterior and interior styling, but mechanicals were largely unchanged.

Nissan Frontier – 5,697, Up 10.5 Percent
The Frontier is a distant second to the Tacoma's command of the midsize market, and the double threat of the 2015 Chevrolet Colorado and GMC Canyon are almost certain to bump the Frontier down to third or fourth place in midsize sales once they reach showrooms. However, Nissan has made some incremental improvements to trim, features and efficiency to keep buyers interested.

Honda Ridgeline – 1,328, Down 14.7 Percent
In its last model year of the current generation, the Ridgeline is certainly not one of Honda's volume leaders but maintains a strong following among those that like its car-like comfort and packaging. Despite its low sales volume, Honda has committed to a second-generation model, expected to debut sometime in 2016.

Nissan Titan – 956, Down 7.9 Percent
The current Titan is showing its age, with the 2014 model getting a few detail upgrades. A new model is coming soon, which is expected to go on-sale in calendar 2015. The most significant announcement is the availability of an optional 5.0-liter Cummins turbodiesel V-8.

Chevrolet Colorado – 5, Down 98.8 Percent
It's been more than a year ago since the last GMT-355 Colorado rolled off the line in Shreveport, but there are a few stragglers left on dealer lots. A grand total of five were moved for April.

GMC Canyon – 0
The outgoing Canyon finally flatlined for April, but fans of GMC's midsizer need not wait long for a vastly improved replacement coming within the next six months. Diesel fans will have to wait a year longer, but the V-6 and I-4 Canyons should be in dealerships by fall 2014.