I have a Chevy Silverado 1500 Ext. Cab and I am pulling a 2H GN Aluminum with 4' SW Dressing Room. Because you are in North Dakota, I would highly suggest an aluminum trailer to minimize rusting issues. It will also weigh less than a steel trailer and with a 1500 series, you will also want to watch the weight of the trailer. Here's a few things to think about:

* What is your vehicle's MAXIMUM towing capacity? If you have 2 16H horses, I would estimate horse and tack weight at about 2700 lbs (horses at 1200# each and 300# for tack and hay). If your MAXIMUM towing capacity is 7,000 lbs., you need to find a trailer no heavier than 4,300 lbs (as a general rule). I am assuming your truck is a 1/2 ton and would think a 3H enclosed trailer might be pushing the weight too close to the limit so I would think a 2H would be a safer option.

* North Dakota can get COLD, so you may want to limit your search to a fully enclosed trailer as opposed to a stock trailer or stock combo.  If you can find one with some insulation, that might also be beneficial.

* For a budget of $9,000 you should be able to get a pretty decent used trailer. I personally would prefer to get better quality that is used but in good condition rather than buy something new that's not made as well. In the long run, the better trailer will last longer and hold it's value better for re-sale.

I am not too familiar with some of the brands which may be more prevailent in the north central area, but here are a few that seem to be very good quality in my area.

Hart, 4 Star, Platinum Coach, Infinity, Cimmaron, Elite

Good luck in your search.