I just purchased a super C toyhauler by Gulf Stream this past December. It is the Enduramax Gladiator model, 36' long, two slides, dual air, 6kw generator, along with all the other amenities. The garage area is large enough to carry two motorcycles or for sure, two large dogs. This is a 2008 model with only 4400 miles on it when I purchased it. The lift in the back is rated at 1600 lbs. There are many mechanical things on this rig that can cause trouble and $. It has been my experience with TT, 5W, or MHs that you just need to expect things to not work exactly like you wish they would. It does not seem to make any difference whether it is new or use. They all break at some time or another. If you can live with this, then welcome to the club. I suggest you purchase your first rig from a RV dealer rather than from an individual. The dealer will go over all the systems and demonstrate how to use them. If something does not work, then it can be fixed at that time. Most will give a short term warranty with the purchase or you may be able to purchase a warranty. Ask that question. By all means, take the unit for a test drive. You can learn alot about how the unit rides, handles, the sounds it makes going down the road, etc. If it is used, look for the obvious such as leaks, rust, condition of tires. Climb on the roof to look at the general condition. Some units could have damage that you may not see until after you purchaed it.
So far, my unit has given me little trouble. I fixed the minor problems without calling an RV tech. A super C is heavy and is hard on fuel economy. Of course, this depends on how you drive and what you are pulling. I pull a Jeep Wrangler and get between 8 to 10 miles per gallon at 65 mph. I think the engine is still tight and the milage will improve with time. I hope this helps a little. Ask if you have more questions. This rig is new to me, so I'm still learning.
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