Our heavy duty, open utility trailers will get you and your cargo to your destination
safely. Choose options from full mesh sides, ramp gates, and lumber treatments.

Never fear the weather or lack of security again. Give your cargo the
extra protection it needs with aluminum or steel enclosed trailers.

Trailers for Work

Find the right trailer for your business. All of our flatbed, dump, and
equipment trailers are built with heavy duty main frames for tough, everyday use.

Sport Trailers

Snowmobiles, dirtbikes, jet skis… oh my!
Our sports trailers will saftely transport them all.

Other Trailer Products

Need a truck bed trailer? Extra ramps? Insulation, lighting, wheels, or graphics?
We can upgrade your trailer to suit any purpose, or build one from scratch!

Portage, WI
Trailer Sales

Delivering top-notch trailers since 1985

Find the perfect trailer at our Wisconsin trailer dealer. Find the perfect trailer at Big O's Trailers. We are conveniently located just off Interstate I90/94. Stop in today and see why we continue to grow. We are a full trailer dealership with a sales, service, and parts departments. Big O's Trailers was started in 1985 by Orland and Joanne Breunig. After Orland's death in 2003 the tradition has been carried on by his three children. Trailers have been our focal point of our business for 30 years. Whether you're a local or if you're coming from Fond du Lac, Madison or Tomah, our trailer store and repair shop is geared up to meet your business or personal hauling needs!

Our mission is to provide you with the knowledge essential in choosing a trailer to fit their needs. After the sale we are available to answer questions and provide the parts and service you will need to maintain your trailer. From bearing packs to fender repairs our service department is equipped to get you back on the road, in no time at all.

Have a trailer brand preference? Quickly search our wide selection of trailer models and makers here:

» Aluma
» American Hauler
» Legend
» Midsota

» Nova
» Thunder
» Trailerman

Trailer Parts and Services

Call 608.742.2473 today!

Big O's Trailer Promotions

Labor Day Hours

We will be closed Monday September 5th -

Have a Great Weekend!

Looking Good Tom Bulgrin!!

Thank you Tom Bulgrin for your continued Business!


Happy Customer: Leroy, I received the door latch in time before our trip, and installed it in a matter of minutes… It was rather easy. Received your invoice today, and have put a check in the mail. Thanks again!!! - Pat


Join us on Facebook

September 2, 2016
We will be closed Monday September 5th for Labor Day. Enjoy your weekend!

View our Facebook page. »


Stop in and see us at our Portage, WI trailer shop!

Just off Hwy 90/94, North of Madison and Milwaukee.

Weekdays: 8 AM - 5 PM
Saturdays: 8 AM - 12 PM

Visiting Address:
W10630 Hwy 33 West
Portage, WI 53901
Get driving directions. »

Call us at 608.742.2473

Can't find what you're looking for? We may have a trailer or part on order or on its way to the dealership. We can also perform a nationwide search or set up an appointment to assist you in designing a custom trailer.

You can reach us at