@Germanshepherd , I have a four banger, and love it. You have to understand what you're dealing with though to appreciate it. I have no issues going up hills on the freeway, or merging with traffic. It does 70 - 75 down the freeway just fine. BUT, and it's a big but, there are two things you really need to keep an eye on. The first is weight. Keep the rig as light as possible. The second is gear ratios. When you go for bigger tires, plan on changing out the gears. I used a 27" tall tire as my base and worked from there. For instance, with a 31 or 32" tire, go with a 4.88 ratio. You've got 5 gears, use them all. It's easy to dog out the four banger, but I like mine. YMMV.