I have the same camper and I was wondering about the tire size and pulling with a Sienna which is pretty low as it is. Also did you make a youtube video where there was something about the axle ? Thanks
The Sienna is a lower hitch and the larger tires might not be the best way to go although you might be able to just flip the hitch to raise it up a bit. https://www.youtube.com/watch?v=ESkN1ZSMIsE