Do I think it would work, yes. Do I think it's a good choice???
The things I would be thinking about is the amount of jolting it would experience during travel. I find my bus basically moves as a unit. I'm amazed at how well things stay in place when cruising down the road.
But, if I hit a bump, hole, go over a curb that rocks the bus from side to side, the jolting and whiplash effect is much more pronounced.
Not that RV products are anything to cheer about, lotta crap out there, but they are designed for going down the road.
I also think house units are used in calmer weather. My experience is when camping, the wind picks up and the awning can get a good workout, especially if it's mounted so high on your rig.
If you're willing to roll the dice, go for the home one and if it doesn't work, well, you can amortize the cost over how ever long it did work.
Since you're attaching it to your deck, it will be easy to replace and not worry about extra screw holes in the bus.
Best of luck.