Weight is not an issue, cubic measurement is the killer as the freight is likely to be £4000 or so for a RIB on a trailer.
Trailer .... erm .... needs to be as road legal as my trailer is

but I suppose it needs to be able to get to Marchwood docks somehow and then do 40 miles from the arriving port here to 'home'. Home to wetness and back again is only a couple of miles at low speed so after the initial trip, if it has wheels and a hook it will do
Ribcraft I think are rather more expensive? but I will have a look at their site on the weekend.
Are the above mentioned Vmaxes advertised on here?
I think I would prefer a single plus aux as the main potential hazard here is rope/net discarded from fishing vessels and ending up with two engines tied together isn't much help