I do not claim to be any sort of legal authority on this matter, and the legality of this towing arrangement is the biggest concern.
We've done the rounds in finding the perfect towing setup; tent, slide in camper, enclosed trailer with living quarters... They all had serious drawbacks. Likely the best option remains a custom trailer built by
Poulsen Trailers out of Logan. We were close to pulling the trigger on one, but in the end we couldn't justify dropping $35k on a trailer alone.
Last year our setup was an enclosed trailer and a 3/4 ton Duramax. The trailer just didn't cut it for living quarters, so I started doing the research for a replacement. I kept coming back to
buckingbronco's solution. I probably read his thread 10 times and decided that's what I wanted to pursue. Now, keep in mind Kami is particular about her trucks. Talking her into having a non lifted flatbed was no easy task. She finally came around, on one condition: It can't be a Ford. I have nothing against Fords, but she just doesn't like their interiors. Lucky for me, 95% of flatbeds on the market are fords.
And so the "research" began. I found a few people talking about this online (Pirate) and most said it was a good idea, but don't even think about it unless you're going bigger than one ton. And of course, medium duty GM trucks have the larger Kodiak cabs. Neat truck, but this is going to be our 2nd vehicle, to be driven on days when we can't carpool to work, or for me to run to the parts store while she's our doing something in our DD. I couldn't see myself pulling into work with a kodiak. A Dodge would have worked, but I only found a few and all were out of my price range. Not to mention difficulty with insurance and registration costs on medium duty trucks.
So that led me to the question, is a 1 ton dually SAFELY and LEGALLY able haul a rig on the back? Well, I see SRW 3/4 tons hauling 10 or 11' truck campers (3500lb+ dry weight) with a boat behind them fairly regularly. So either they're oblivious or they know something I don't (definitely exceeding GVWR). So I turned to the RV forums. Not surprisingly, weight is a frequently discussed topic in those forums. This is one recent, helpful discussion on the matter:
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/26294650/srt/pa/pging/1/page/1.cfm What I found was a truck load of opinions on the subject. In the end, most agree that a door sticker GVWR doesn't hold much legal weight, and you will not be ticketed for being over. I spent some amount of time thumbing through the Utah Code regarding Motor Vehicles, and didn't find anything on the subject. After I purchased our truck, I took it to the DMV and they asked if I wanted to keep the 20k pound GVWR rating on truck. This truck was used as a work truck, and apparently they had registered it over weight. While insuring the truck, I verified with my insurance company that it was registered to 20k pounds, which exceeded the GVWR. I told them I may exceed the GVWR, but according to the registration that was within my legal rights. I asked if I would have any problems with insuring the truck in an accident where I exceeded GVWR, and I was surprised that the answer was NO.
In the end, we picked up a 1 ton GMC 3500 with 130,000 miles for $14k. After selling our DMAX for $20k and our enclosed for $3k, we were able to pick up a pretty nice 18' lightweight RV (450-500lb tongue weight) for $10k. Almost broke even
I added the extension, pretty much identical to buckingbronco's and sought advice from
Mac's Tie Downs. I worked with one of their guys that helped me come up with the best solution for tying it down. We ended up using a strap over each tire with blocks that bite into the tire. They were an awesome company to work with.
So, how does it drive? With the RV in tow, I feel like this is a safer arrangement than most of the previous setups we have had. I can stop faster with this than I could my Dmax and enclosed. I am more stable than with the slide in truck camper (not surprising, DRW makes a HUGE difference in towing). Yes, the front end feels lighter, but not to the point that I feel unsafe. Yes, I absolutely dread towing through my first snow storm with the whole setup. All said and done, we are VERY happy with this arrangement. I need to fix the airbags (leaky) and swap out the rear leaf springs with a higher rating, and it will probably ride like a Cadillac.
I wish I had a more current picture with the whole setup. This is as I was building the extension: