I can only speak for myself Dubrus ..but Poly hit the nail on the head.. great cheapness and easy of moving on land.
Pushing a SIB on a trailer down banks and across beaches is NOT
the same as pushing a heavier RIB on a trailer.
I gave up a hardshell boat around the same weight as a small RIB because I was killing myself launching off beaches. I find it is far easier with a SIB.. but if it is too hard to push on the trailer..I haul it off and put it on inflated rollers to get it to the sea.
I doubt if any 60 year old could single handed shove a SR4 to the sea in the typical places I launch my boat ? If they do..they are a lot stronger than me.
Some random but typical launch and recovery beaches I use..
150 yards of soft sand ..rocks and seaweed ..SIB launched and recovered at low tide..no problem
100 yards of large stones after coming down 6 feet of grass banking...
50 yards of rocks sand and seaweed after a steep grassy banking..launched..waiting for the tide so I can get an early start.
I regularly single handed launch and recovered on all these shores in the photos..and do similar launch and recovery most places I go.. slipways are a luxury for me... and mostly in places I don’t go.
As for comparing costs ... My set up.. 4.3 meter Quicksilver..25 hp outboard .. trailer ...and a lot of extras including cover ..launch wheels .. trailer ..all only 6 years old.. pristine condition .. and hardly used ...cost one third the price of the SR4 on sale here at present. I have seen some SR4s going for sale at 5 times the price I paid for my set up.. so very much cheaper than RIBs too.
My second hand set up the day I bought it... and it 1/3 the cost of a decent SR4
I have had heavier boats in my past.. and getting lighter boats as I age. I’m afraid I need a heavy RIB as much as I need lead diving boots.
Last year .. I did considered the light ali hull “RIBs” like the Highfield Classic range ..and also the F-RIB range ..both brands are even lighter than my SIB.. but I cant justify the extra cost..while I can still launch and recover my own setup. I am still thinking of a lighter trailer though
Thats why I have a trailer SIB