The ratchet strap I use on the stern came with the boat, it is now a bit rusty but don't think I would spend a lot of money on a stainless one, a squirt of WD40 once in a while is all that is needed. Critical things for me in keeping the boat on the trailer are:
- Replacing the stupid winch straps with Dyneema rope which is much stronger, unlikely to be damaged, easier to use and generally better in every respect. £25 to safeguard a £30k boat. Not a hard decision!
- Independent rope/chain/strap from the bow eye to the trailer chassis
- Securely strapping the stern down so it doesn't bounce/shift on the trailer
- Making sure the winch is always in good condition, the ratchet etc is properly lubricated so there is no chance of it sticking or slipping
I tow my boat on very rough unsurfaced roads, which is one reason I'm changing the trailer as I'm worried about hull damage on the current one. On the bow eye, what I have is a long 10mm nylon rope (~2000kg break rating) with a big stainless snap hook onto the bow eye, this loops down around the chassis and back up through the eye about 4 times in total and is then tied off to the chassis. I can get it very very tight and there should be no way it will break but I have always wondered about the ultimate strength of the bow eye.
A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...
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