Re: Which Guide-on for my trailer
These should work with no drilling of the trailer. They're bunks though, not rollers. Got anything against bunks?
http://www.cabelas.com/p-0037796018238a.shtml
Those are the only guide-ons I've ever seen as advertised to attach ONLY to the rear crossmember of the trailer, instead of the side rails like most.
And Iboats offers these, which appear to mount similar, but it says they are out-of-stock. AND I don't think they'd sit at the right angle for your dropped rear crossmember. Their photo shows a straight rear crossmember. Also not rollers.
http://www.iboats.com/Low-Rider-Gui...5154104--**********.433994529--view_id.685854
I also believe an inexpensive trip to the hardware store might allow you to attach many types of guide-on's to the rear cross-member instead of to the side member like they alway show in their advertising photos. Get a little creative and study the pics and you can probably find an easy no-drill solution. But if you go this route, do NOT forget to compensate for that angle of your dropped rear crossmember...that will limit you somewhat and create a little challenge.
Having said all that, my honest opinion: I would have absolutely no fear of just drilling a couple holes in these steps so you could use others. It's really not that difficult...you just need 2 holes in each step for the u-bolt to pass through. And I'm sure that step is just thin sheetmetal. If you get past the fear of drilling, you can use MANY types of guide-ons and won't be restricted to that one shown above.
The VERY best alternative, but a little more pricey, will be to have some custom-welded/fabricated, and then welded to your trailer. Paint them yellow when finished for a true factory look instead of they typical ugly U-bolt afterthought look these guides always give. This is very simple and quick metalworking for someone who knows how to weld.