ive a mate with a 175 and beach launching is a right hand full should there be a little swell on the boat can & does lifts me off my feet and im 18 stone great boat to fish from the engine is a little small been a 75hp im also thinking of buying a new 175 package that comes with a 100hp suzuki or the 165 with a 60hp suzuki not real happy with the std package Id go for a 165 with an 80 hp or the 175 with a 130 hp or better still twin 75hp etecs but your talking ££££££££££
depends on how good you are at it I could almost do it on me own
plenty launch 175's at filey without diping there tow truck , good double wheel barrow jockey wheel is the key
I used to launch the 19 ft boat I built before I got my trophy with me and my 6 year old son [ now 18 time fly's] no problems if there was any swell just surfed on in and beached it ,
two of us beach launce the trophy and have never diped the landey in the sea yet even in Scotland just time the launces with the tides and have a push plate on the towbar to send it on it way down the beach and she's thick end of 2 1/4 tone without the trailer
a 175 will only be 1500kgs or so laden
all that said I have been doing it 30 years and have seen plenty that have been doing it a while with small boats like yours Alan struggling , mainly as the have never bean told what to do or seen how easy it can be done
best advice I can give is go watch someone who can do it well and learn there tricks