The Pre-Buy Is Over: Can Service Bays Carry Truck Dealer Stocks?

On June 29, Rush Enterprises, Inc. (RUSHA) bought five Peterbilt dealerships in Baton Rouge, Lafayette, Lake Charles, New Orleans and Houma for about $36.9 million, according to its quarterly 10-Q filing. In theory, a truck dealer makes money selling trucks. The same filing shows otherwise.

Rush earned a 7.8% gross margin on new Class 8 trucks in the second quarter, while its service and collision work historically runs at 66% to 68% and its parts counters at 28% to 30%. The profit mix tracks that gap. Aftermarket products and services produced 64.0% of the company's gross profit, while new and used vehicles, the product on the sign out front, produced 25.7%.

That split matters more now that the 2026 order boom has run out of build slots.

Eight Cents on a Truck, Sixty-Six on a Repair Order

Rush management calls its absorption ratio a metric "of critical importance." It divides gross profit from parts, service and collision by the dealership's overhead, excluding vehicle selling and inventory carrying costs. Above 100%, the back of the building pays every fixed bill, so the gross profit on each truck sold, after commissions and carrying costs, drops straight to operating profit. Below 100%, the math reverses. Then a slow sales month comes out of earnings.

Rush ran at 130.8% in the second quarter, down from 135.5% a year earlier. Why the slip? Aftermarket gross margin fell to 35.9% from 37.6% as more work shifted to national fleet accounts and pricing tightened, the 10-Q explains. Aftermarket revenue rose 1.5% to $645.7 million, yet aftermarket gross profit dropped to $231.5 million from $239.2 million.

More volume, less margin per repair order. On $645.7 million of quarterly aftermarket revenue, those 1.7 lost points equal roughly $11 million of gross profit a quarter. That is about 15% of Rush's $72.8 million second-quarter net income, or close to a third of what it paid for the five Louisiana stores.

The Pre-Buy Pulled 2027 Into 2026

Fleets spent the past year buying ahead of the Environmental Protection Agency's 2027 nitrogen oxide (NOx) engine standards. North American Class 8 orders through August ran 111% above the same stretch of 2025, and 12-month orders reached 350,677 units, per FTR data.

Then the assembly lines filled. Model-year 2026 build slots are "virtually sold out," FleetOwner reported, with second-half backlogs oversubscribed by about 35,000 units. Compliant 2027 powertrains are estimated to add $8,000 to $12,000 per truck.

The EPA's July 9 proposal would trim that bill, with estimated savings of up to $6,000 per new truck, but it remains a proposal. Dan Moyer, senior commercial vehicle analyst at forecaster FTR, put the calendar plainly.

"Overall, August marks the close of the 2026 order season and the effective end of the EPA 2027 NOx pre-buy."

Who Owns the Repair Order

When new-truck demand cools, which dealers keep earning? The ones whose service bays already cover the overhead. Valuations are as of Oct. 5, 2026.

Rush Enterprises (RUSHA): The Purest Aftermarket Exposure

RUSHA trades at 21.3 times trailing earnings and 17.2 times forward estimates, with a price-to-sales ratio of 0.76 and price-to-book of 2.36, per Rush valuation data. The 10-Q shows second-quarter revenue of $1.9 billion.

In the same filing, management expects aftermarket revenue to improve in the second half, "with the potential for modest growth," and guides blended aftermarket gross margin to 35.5% to 37.5% for 2026. The risk is on the balance sheet: inventories climbed to $1.69 billion at June 30 from $1.53 billion at year-end.

PACCAR Inc (PCAR): A Parts Annuity Inside a Truck Maker

PACCAR Inc (PCAR), parent of Kenworth, Peterbilt and DAF, runs 21 parts distribution centers covering more than 4 million square feet. That network produced record parts revenue of $1.75 billion in the second quarter and $417.0 million of pre-tax income, about 24 cents per parts dollar, against roughly 10 cents of net income per dollar for the whole company.

"The improved North American freight market will increase our customers' truck utilization, which will deliver increased parts and service business," said Bryan Sitko, general manager of PACCAR Parts.

PCAR trades at 23.1 times trailing and 16.6 times forward earnings, with a price-to-book of 2.84, per PACCAR valuation data. The risk shows up on both sides. First-half parts pre-tax income slipped to $819.3 million from $843.0 million. Truck sales, which feel any post-pre-buy slowdown first, still drive most of the company's revenue. Analysts' PCAR earnings estimates will show whether a 2027 truck hangover is priced in.

Penske Automotive Group (PAG): Trucks as One Slice

Penske Automotive Group, Inc. (PAG) runs Premier Truck Group alongside its car dealerships. Its commercial truck dealerships earned $47.2 million before taxes on $927.8 million of second-quarter revenue, down from $54.2 million a year earlier, as weak late-2025 orders thinned deliveries. Service and parts revenue there rose 5%.

PAG is the cheapest of the three on earnings, at 14.6 times trailing and 14.4 times forward, per Penske valuation data. The trade-off is diluted truck exposure and a leverage ratio that rose to 1.7x from 1.5x, per its earnings release.

Company	Ticker	Market Cap	EPS (TTM)	P/E (TTM)	P/FCF	ROE	Yield
Rush Enterprises	RUSHA	$5.51B	$2.21	21.3	15.8	11.8%	1.19%
PACCAR	PCAR	$57.37B	$4.75	23.1	19.5	12.8%	2.57%
Penske Automotive	PAG	$13.22B	$13.75	14.6	22.6	15.8%	2.88%

Independent Dealers Are Selling the Back of the House

Two weeks before the Louisiana deal, the 10-Q shows, Rush bought Carrier Truck Center, five International dealerships in Ontario, for C$25.2 million. Consolidators are buying parts inventory and service bays with fleet customers attached.

For an independent dealer group weighing a sale, the numbers that set the price are the ones Rush reports every quarter: absorption, aftermarket margin and parts inventory. Parts turns and technician utilization feed the gross-profit side of the absorption ratio. Smaller groups that lack a full-time operating executive to own those numbers sometimes turn to fractional COO support, a part-time arrangement rather than a permanent hire. Compare a private store's absorption with Rush's 130.8%. That gap is the consolidator's margin opportunity.

The Oct. 27 Absorption Test

RUSHA and PCAR are expected to report Oct. 27 and PAG Oct. 28; the Barchart earnings calendar will confirm the dates. In its July 28 release, PACCAR estimated 2026 U.S. and Canada Class 8 retail sales at 230,000 to 270,000 trucks. The questions for each print: does Rush's absorption hold above 130%, does PACCAR Parts grow as deliveries peak, and does Penske's truck service revenue keep rising?

RUSHA offers the purest aftermarket exposure at about 17 times forward earnings, while PCAR pairs 24-cent pre-tax parts margins with the highest trailing P/E of the three. PAG is cheapest, with the least truck exposure.

Rush paid $36.9 million for the five Louisiana stores. In the second quarter alone, its aftermarket departments produced $231.5 million in gross profit.

On the date of publication, the author had no positions in any of the securities mentioned. This article is for informational purposes only and does not constitute investment advice.