age old questions regarding truck tyres

I have been contemplating putting truck tyres on the RZR for a while and must have searched loads of threads but still struggling to find the answers. my reasons are most of the miles I do are on tarmac (asphalt) roads, on a 200 mile off road trip we can cover 150 miles on road getting to and between trails. secondly there is a better selection of tyres over here in that market and on 15" wheels I’ll have an almost endless amount of tyres to pick from.

so things I seem to have an issue with.

will the increase in PSI and tyre stiffness have a massive effect on handling, will it make the buggy bouncy etc.

will I need to change wheels to beadlocks to drop the pressures lower than the tyre is designed for?

am I going to shift failure points to suspension components??

will I need to play with the suspension a lot?

is the weight of doing this noticeable on the speedo side of life and on the fuel used?

lastly I planing on a tyre TYPE of say a BF Goodridge style but sticking to the stock 26" overall hight (if possible).

just doing some research I dont wont to plunge in a buy new wheels and tyres and hate them.

currently running stock 12" and maxxis bighorns all round.