Ben's bike is a Mini Tike from Trailmate. Below is the picture from the website. Unfortunately, it doesn't come in red anymore...just yellow.
In the end, we had to make one more adjustment. The trike was really tippy. Scary tippy. Ben actually tipped it for real once, but luckily, my dad was standing right there when it happened and was actually able to catch him.
I wasn't happy with the tippyness factor so we asked my cousin's husband (a welder) to help us out. He widened the back wheel base by about 6 inches as you can see in the picture below.
It really made all the difference and we haven't had any tipping issues since.
Ben absolutely LOVES his bike. And has even decided that he's OK with it being yellow.