Do some research and talk to the folks over at Zuwharrie.com. They will probably give you a different response if you post your question on their site.
Here are my
as a former Sami owner. 1. If you decide to run a tire larger than 31" will need change out the axles (normally Toy or Waggys). 2. The wheelbase is a little short if you do much climbing. Wheelstands tend to be the norm.
3. If you do run a bigger tire, don't expect to make it to 55mph on the highway. A 1.3 is just that, a 1.3.
On the other hand, the Sami is light and can take you some places a mid or full size rig can't. They are pretty cheap to get into and with a minimal amount of work will take you to a lot of places. And finally, you can spend more than
add a bunch of Toy parts, extend the wheelbase and swap the motor and do quite well.