I currently drive a 2005 Triton TR-20X on a Marine Master trailer. Previously, I drove a 1997 Cajun Pro 178 with a Trailboss trailer. Prior to that, I had a 1995 Cajun Pro 171 with a Trailboss trailer. And even prior to that, I had a 1994 Cajun Pro 171 with a Trailboss trailer. I've driven and trailered Rangers, Nitros, Skeeters, Javelins, Bullets, and a bunch of other boat brands - including aluminum rigs and even a Gheenoe. With the exception of the Gheenoe, none of them ever needed boat guides. The only boats I've ever trailered that did benefit from having them were big saltwater boats and a pontoon. Now, there have been times on the Chickahominy or James rivers, when the water was rushing in our out so fast that I thought it might be neat to have them, but I've noticed people with them getting their boats all jacked up because the minute their bow was passed the guides, the rushing water was pushing their stern away too fast. They literally got tangled up in their own boat guides, making them more of a hindrance than a help. I just practiced and eventually learned how to load a boat on tidal waters. I was power loading though. I wouldn't have wanted to try to load it manually without power loading. The boat would have been everywhere, and again - I don't think the guides would have helped much. It might have been easier to drive onto the trailer until the boat stopped, and then winch it the rest of the way, but I'd be too temped to power load and get off the ramp, especially in a large tournament.
The only one of my own boats I ever had problems loading onto a trailer was the '94, trying to load it manually on a "no outboard" lake. They would let you troll around on electric motors with the outboard tilted up high enough that the prop was exposed. You couldn't start it though. The ramp was VERY steep, so the back end just dropped down quickly. With the wind blowing, you almost had to get into the water to keep it on the trailer as your partner pulled up. What I ended up doing in that case was to tie a rope to the aft cleat on the windward side. I'd go on the side of the ramp and hold the rope to keep the transom lined up on the trailer as my fishing partner pulled up slowly.
All the best,
Glenn