I put 35 and 40 in my '90 3-Door Pajero. It's great for it, doesn't wallow or skid at all. The only thing that you lose is comfort if you over inflate you tires by about 10 to 15%. Any higher, and the tire starts bouncing all over the place.
I think this Bolan might not be too bad with 45. It's got narrow tires remember, not 205s or anything, so a higher pressure might be needed. Still, I haven't got any experience with it. Incidentally, the max allowed pressure rating printed on a Dunlop Grandtrek I once used was 65 PSI (Never went THAT high!).