About Cap Connection

GMC Sierra Truck Accessories near Milwaukee

Bed Caps, Tonneau Covers, Roof Racks & More

Give your GMC Sierra the tailored upgrades it deserves. Our Waukesha location carries a wide selection of high-quality truck caps, tonneau covers, ladder racks and much more to improve the functionality, style and protection of your Sierra. Whether you’re gearing up for tough jobs, long road trips or everyday commuting, our expert team can help you find the perfect accessories to match your needs.

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Upgrade Your GMC Sierra with Custom-Fit Add-Ons

A well-equipped GMC Sierra is capable of handling just about anything Wisconsin roads (and weather) throw its way. We source each product with an eye toward reliability and compatibility, ensuring your Sierra looks great and performs even better. From streamlined tonneau covers for cargo security to rugged ladder racks for worksite demands, the right accessory can make all the difference in your day-to-day operations.

Popular GMC Sierra Accessories

Tonneau Covers

Protect your cargo from the elements and keep everything under wraps with a sturdy tonneau cover. Choose from soft roll-up, hard tri-fold and retractable options, each designed for quick access and dependable coverage.

GMC Sierra Truck Caps

Convert your open bed into a secure, weatherproof space with a custom truck cap. Our caps come in fiberglass, aluminum and other materials, offering the perfect balance of durability, style and functionality for your GMC Sierra.

GMC Sierra Ladder & Bed Racks

Elevate your cargo-hauling capabilities by installing a bed rack or ladder rack. These systems keep ladders, lumber, sporting gear and more organized above your bed, preserving valuable storage space below.

GMC Sierra Roof Racks

If bed space is at a premium, a new roof rack could be the perfect solution. Store bikes, skis, boxes and additional gear overhead to free up your truck bed for everything else on your list.

Running Boards & Step Bars for GMC Sierra Trucks

Make climbing in and out of your GMC Sierra easier while adding a stylish exterior accent. Running boards and step bars not only offer practical footing but also enhance your truck’s overall appearance.

Additional Accessories for Your GMC Sierra

A wide range of other enhancements is available to tailor your Sierra to your unique lifestyle and needs. Floor mats and seat covers help keep your interior fresh, toolboxes and storage systems maintain organization and fender flares or splash guards protect your paint job from Wisconsin’s challenging road conditions. You can also find trailer hitches, lighting options and so much more in our inventory.

GMC Sierra Stats by Year

	1988-1998 (GMT400)	1999-2002 (Early GMT800)	2003-2006 (GMT800 Refresh)	2007-2013 (GMT900)	2014-2015 (K2XX)	2016-2018 (K2XX Refresh)	2019-2021 (T1)	2022-Now (T1 Refresh)
Engines	4.3L V6 5.0L V8 5.7L V8 6.2L Diesel V8 6.5L Diesel V8	4.3L V6 4.8L V8 5.3L V8 6.0L V8 (HD) 6.6L Duramax Diesel (HD, from 2001)	4.3L V6 4.8L V8 5.3L V8 6.0L V8 (HD) 6.6L Duramax Diesel (HD)	4.3L V6 4.8L V8 5.3L V8 6.0L V8 (HD) 6.2L V8 (Denali 1500) 6.6L Duramax Diesel (HD)	4.3L EcoTec3 V6 5.3L EcoTec3 V8 6.2L EcoTec3 V8 6.6L Duramax Diesel (HD)	4.3L EcoTec3 V6 5.3L EcoTec3 V8 6.2L EcoTec3 V8 6.6L Duramax Diesel (HD)	2.7L Turbo I4 4.3L V6 5.3L V8 6.2L V8 3.0L Duramax I6 (from 2020) 6.6L Gas V8 (HD) 6.6L Duramax V8 (HD)	2.7L Turbo I4 5.3L V8 6.2L V8 3.0L Duramax I6 6.6L Gas V8 (HD) 6.6L Duramax V8 (HD)
Transmissions	4-speed/5-speed manual 4-speed auto	5-speed manual (HD models) 4-speed auto	5-speed manual (HD) 4-speed auto Allison 1000 (Duramax)	4-speed auto (early) 6-speed auto Allison 1000 (HD Diesel)	6-speed auto Allison 1000 (HD Diesel)	6-speed or 8-speed auto (1500) Allison 1000 (HD Diesel)	6-speed auto 8-speed auto 10-speed auto (select engines) Allison 10-speed (HD Diesel)	8-speed auto 10-speed auto (select engines) Allison 10-speed (HD Diesel)
Cab Configurations	Regular Extended Crew (HD models)	Regular Extended Crew (HD models)	Regular Extended Crew	Regular Extended Crew	Regular Double Crew	Regular Double Crew	Regular Double Crew	Regular Double Crew
Bed Configurations	6.5 ft (standard) 8 ft (long)	5.8-6.5 ft (short/standard) 8 ft (long)	5.8-6.5 ft (short/standard) 8 ft (long)	5.8-6.5 ft (short/standard) 8 ft (long)	5.8-6.5 ft (short/standard) 8 ft (long)	5.8-6.5 ft (short/standard) 8 ft (long)	5.8-6.5 ft (short/standard) 8 ft (long)	5.8-6.5 ft (short/standard) 8 ft (long)
Trim Levels	SL SLE SLT Sierra GT (select years)	WT SL SLE SLT Denali (from 2002)	WT SL SLE SLT Denali	WT SLE SLT Denali	WT SLE SLT Denali	WT SLE SLT Denali All Terrain	Pro/Base (Sierra) SLE Elevation SLT AT4 Denali	Pro SLE Elevation SLT AT4 AT4X Denali Denali Ultimate

GMC Sierra Accessories for All Generations & Trim Levels

From older models to the newest GMC Sierra releases, our products are carefully chosen to fit specific bed lengths, cab types and trim packages. Unsure which exact parts work best for your year or model? Our knowledgeable staff is here to guide you, ensuring every accessory is the right match for your truck.

Serving GMC Sierra Owners across Southeastern Wisconsin

Our Waukesha store proudly supports GMC Sierra drivers from a broad area. Whether you live in Muskego, West Allis, Milwaukee, Wauwatosa, Mukwonago, New Berlin, Delafield, Brookfield, Menomonee Falls or right here in Waukesha, we provide a one-stop solution for all your truck accessory needs. We combine a vast product selection with professional installation services to help you transform your GMC Sierra into the versatile vehicle you’ve always envisioned.

Get Expert Advice & Installation

Ready to start customizing your GMC Sierra? Contact us or stop by our Waukesha location for personalized recommendations and reliable installation. Our team will make sure you drive away with top-quality, long-lasting accessories—so you can enjoy your upgraded GMC Sierra on every road, jobsite and adventure.