I've not used it much, but based on the build quality and ergonomics (recessed tie points in particular) of my 14' tri axle tipper I bought secondhand, I'd look at Brian James. I'd discount a tipper for mainly moving plant though- however you spin it, they are a pig to use compared to a flatbed.
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For Devon lanes I'd be looking to keep the width down- which was a large part of me going Nugent- 6'7" width, flat to the edges (allowing overhang) and a full width rear ramp that I can pull the supports from easily to load over width things. Every other manufacturer seems to assume that as soon as the trailer is over 12' long then customers want the max legal UK width!
Nugent do a 14' 6'7" wide tri axle flatbed that would be tough as old boots (13" Savero wheels on damped leaf springs, nice reliable Knott axles) but it doesn't look particularly manouverable. Honestly, I'd stick with double axle for narrow lanes. I'd also question whether 14' was long enough- it's easier to get the balance right on a 16', and I find narrow width more important than the extra length. Don't get me wrong, I'd have a 14' if I could get away with it! But no chance with my tractor and implement combos.
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