I wouldn't know about the Tonke, but the Cougar and Jayco are several steps down from your Hitchhiker and I personally doubt you would be happy with them.
With NuWa out of production, and Excel and New Horizon probably also ruled out (price or height), I would suggest looking at used NuWa units.
We went with a special order Fox and it's 12'6", and that is just about as low as Northwood goes (current production models, they have older, shorter rigs)... Although a 27-5L, ordered with the low profile A/C -might- come in at your height.
2008 F350SD V10 with an 2012 Arctic Fox 29-5E
When someone tells you to buy the same rig they own, listen, they might be right. When they tell you to buy a different rig then they own, really pay attention, they probably know something you don't.