Are these the sound units? If they are then the price of £265 is a little less than you have been paying.
No. Theses are just sound units. What I have is the Multifunction unit which incorporates the controlling of the lights as well.
This device has around twenty separate sockets to plug in side lights, headlights, spot lights, brake lights winkers left and right, reversing light, and a tea making machine. (I made the last one up, cause it feels that it should for the price !!) Believe me, as a poor ol pensioner, I have research the prices all over the world and couldn't believe them.
You're right about the Trailer price. These are the cheapest way of getting hold of the rear wheels that I know of. Did you see the price of the large freezer trailer next to the one on Amazon. Phew over £400.
They are very popular these days and clubs are springing up all over the place. I'm actually in three forums which are very interesting. A bit slow on the letters side but the information that's on them is worthwhile.
Can't disagree with you about the prices though. A licence to print money. I'll check back on the diggers and prices as your interested.
regards
ken