There are a few posts on this site regarding this subject, The 3 step option by EZ Loader runs around $375, I went the simpler route and got the single step that bolts on the trailer frame for $20, works great, just requires you to then climb into the bow of your boat after pushing off the trailer….
If I was a person who owned a machine shop, you could make a ton of after hours $$ making these things.. they are so simple in design….