I currently pull the trailer with a specialized expedition which is about worn out. I also own a Gunnar Crosshairs which is my dedicated road bike and I dont feel comfortable pulling with that.

I've been wanting a 29er to replaced the expedition.

I've gained about 70lbs back over the last 2 years which makes it very difficult to ride my Gunnar. So a new 29er might motivate me to ride a little more and start losing some weight again.