Dont go the irrigation.. sounds good.. but after a little time pull it out for a lanacoate touch up , shine a good light up and you will see marks where doesnt dry out well.. thats not good.
And by the time you hook up the hose with quick connector, hose out... you are not using the hose for other stuff at the same time.
We used to do 25 to 35 trips per yr for near on 10yrs..that more than 1 trip per 2 weeks..
Both reasons why I scrapped it.
" I work very hard at being lazy"
Then important part.. crack a beer....
Unload clean down is around 10/15 mins.
Park up jockey wheel faces so boat moves backwards (see motor rinse), pull drum under motor, lower motor pulls the trailer back also. Plug the hose into the side of the drum. Climb in boat, fire engine then I unload, crew put stuff where should go.. racking rods to wash etc.
Grab other hose connect the 'gone 60 sec ' hose container full of GT 18 detergent, foam up the boat trailer, inside outside, and the rods.
Now kill engine, drag out of drum , leave up for now.
Hose blast boat, trailer, up under engine trim area, carpets, clears ...everything, except the dash area.. light spray. Rinse off the rods and rack to dry in shed.
Lower engine to drain.
Mean time crew packing bait / berly in bait chilly bin away, washing chilli bins.
Then filleting..few beers etc
Next day dry rods lubed racked up, mist spray gone 60 sec , inside cabin, carpets upholstery bildge with hand spray gun 10 mins .. stops smells , mold , green stuff.
Rollers, wheel nuts etc a light spray inox / crc , depending if plastic bushes or not. 5 mins.
Glass boat.. messed with lot polishes in the past.....a base of 3 coats ceramic... and light spray and quick spread wipe of supercheap blue tyre shine... of hull decks.. 5 mins
It is less effort, time , work to do this than use a brush when washing the boat.
Work hard at being lazy..
As was putting in ibc tanks and high pressure house pump, so dont need to dry off clears, windows etc because of calcium/ minerals in the tap water.
Down side of lanacoate on trailer is a sort of a light brown muddy effect...
BUT when ppl ask "what is that" suddenly its a great idea....
Hey thats what lanacoate type greases are for, trailers , yacht rigging, farm machinery, tractors, oil rigs.