Still going to do the rump. On Sunday. Not sure how long it will take. Depends on how well you want it cooked or the temp on the remote thermometor that you are looking for. For medium rare I pull at 130 degrees, foil, and rest. Rough estimate four hours. Depends on how well your smoker holds its temps. I have the little remote that is good for about 100', so I can go and work on the car, and still check the internal temp. That is what I do. That's why I really like a remote.. Though i will probably be sitting there looking at it the whole time.
Can I also do vegtables in there as well?? How long would I smoke potatoes, and carrots and such in the smoker at say 225?? Sorry but I can't help you on the veggies. Haven't tried veggies yet. A beef roast smoked with hickory is very nice. A very good first project. Please let us know how it turns out.