Thought I would add my 2 cents...I have a 2012 fully loaded Hawk w/o porta potty. Add two humans, one or two dogs, water, food and my gear and I'm around the 2,000++ pound wt. I had my Hawk on a 1st generation Tundra for two years and we covered 30,000+ miles. I added Airbags (due to 3" squat), E series tires, sway bar and new shocks x4. The truck did "OK", but not great. I was always reminded of this questionable combo while traveling. I know I was compromising my truck capabilities and my luck. Braking was another issue as well....
Now, I have my Hawk on a 3500 Ram CC SRW and I couldn't be happier. The sense of safety and security is worth the extra vehicle wt and physical size between a Tundra and Ram is minimal. MPG are within 1-2 mpg. Most everything underneath, the guts if you will, on the Ram is bigger and stronger. *1 ton vs. 3/4 ton...I would have gone with a 3/4 ton Ram, but I wasn't convinced that the new rear coil springs was a positive improvement vs. leaf springs (I keep my hawk on the truck all year), so I stepped (way) up to the 3500 with leaf springs. My cost from a 2500 to a 3500 was ~$500.00...no brainer to me. I'm still mindful while traveling, but the truck is not compromised and I feel better and safer overall.
Also, in California, if you keep your cab-over , self contained camper on the truck all year, you are allowed to register as a RV, which reduces fees significantly.
Lastly, I am a Toyota veteran, owned several Toyota's. If Toyota (hope they read this) made and offered a 3/4 ton with a heavy payload (Ram 2500 gas engine is ~2900 lbs.) in the U.S., I would be first in line...
Happy Trails