Hey, that is a really great deal. It is the #9890. One very popular roto chicken recipe is this:
https://tvwbb.com/showthread.php?33874-Roadside-Chicken
I just did this chicken a couple days ago with same roto in fact. It came out great and I used an extremely simple recipe and it was better than the roadside recipe and any other chicken I have done.
Basically, it was just a brine on the chicken over night and then slap it on the spit and two hours later, the most tender, juicy chicken I have had in years...seriously. I don't know if it was just the chicken or the method, but it was awesome. I need to do it again to confirm.
But one of the biggest mistakes people make on BBQ chicken is how long to cook it. If you undercook it, you risk Solmonela. If you over cook it, you risk a dry and tough bird. A remote thermometer for the grill internal temp and a quick read meat thermometer are your friends.
Here is how I did my last chicken that turned out so good and was so easy to do:
HOW TO DRY BRINE A CHICKEN
If wet brines aren’t your things, dry brines are just as good, maybe even better. They’re easier, faster, and result in richly flavored meat due to only retaining its own natural juices. Here are the basics to a dry brine.
Step 1: Use 1/2 cup of kosher salt, two tablespoons of baking power, and any herbs or spices you want and mix together in a bowl.
Step 2: Use paper towels to pat dry your chicken.
Step 3: Generously sprinkle the brine mixture over the entire bird, rubbing it into the skin, until the outside of the bird is completely covered. Depending on the size of your bird, you may not need to use all of the mix; too much and it may end up over salted, so don’t cake it on.
Step 4: Loosely cover chicken with plastic wrap and refrigerate for at least 12 hours or up to 3 days.
Step 5: Rinse off the brine, pat the chicken dry, and cook. (Make sure the skin is very dry before cooking so that it will get nice and crispy.)
I just put it on the spit and started it spinning at 350 degrees for almost 2 hours. I had a good sized bird, so yours may not take as long. If you wan't, you can add a rub or spices before cooking, but I didn't. Also, make sure you put a drip pan below the bird to catch the drippings while it cooks. Oh, and I added some wood for smoke on my cook. It gives it a bit more flavor.