I'd borrow one twice a year from another friendly RIBster...For a 6 m RIB you will have no problem getting a loan of one for a day...
Then,.......have a look at the thread further down the page on "Launching On Dry Land" to see how to store your RIB on the hard sans trailer!
Only new to RIB.Net and you've already saved £2.5K on your first day !!
Best wishes,
Stuart