Custom built RV truck conversions and RZR engine swap kits.  From toys to toy haulers, we do it all.

We also do complete RV repair work on all makes and models of RVs and trailers.

Z1 XP conversion kit

Yes, you asked for it and now we are working on it!

"We wanted to take a few moments to tell you how happy we are with our Motor Coach / Toy Hauler from Hawk Engineering.  We appreciated your attention to detail in every step of the way through the design and build process.  After our first trip it was evident that our planning and your experience allowed us to build and own the perfect motor coach for the way we play.

Everything is working as planned and we are really impressed with your continued support of our big toy."


Jim Radcliff,

Kirkwood, MO

Custom Motorcoaches

Looking for a custom build motorcoach the way YOU want it?  Take a look at what we can do for you.  We are not a 'cookie cutter' company.

We are a highly skilled small and personal shop.  Our focus is on building custom, high-quality coaches, matching stacker trailers, and high-performance Polaris RZR engine conversions.  We also do the following:

Repair Services

Performance Side by Sides


Copyright © 2013 Hawk Engineering Inc. All rights reserved.

Hawk Engineering inc. Rv Truck Conversions And Polaris RZR Snowmobile Engine Swaps

RZR cages

We have started producing RZR cages, bumpers, and doors.


Latest Custom Coach

Built on a Peterbilt 359 day cab.

What Clients Say About Us

  • Repair all brands RVs, camping trailers
  • Generator install and repair
  • Roof repair
  • Awning install and repair
  • Electrical trouble-shooting and repair
  • Paint work, 53' paint booth

If you are looking to have more horsepower and dependability, a snowmobile engine conversion is probably what you should take a look at.  We offer Apex and Z1 DIY kits for the Polaris RZR.