Gosh, Love it when people work together with "out of the box" ideas. I was so close to the same idea, but never thought of just extending the frame this way. "my hero"

Caradoc? Is that a "Red trailer",or a Harbor Freight one. Noticed how far back the "A" frame is, compared to my HB. Red trailer is a better frame, using a 2x2 .110 Square stock, with 1 1/2 " angle side braces, just like the "red style". Tongue should be about 18 inch max, past the "A" frame part. Extended mine 24 inches, for ten feet length.