
Just been & measured my Berlingo, agree that 45 wide would be very tight but
may just go, hight is at least 42" but with back seats up floor depth is 32 but only 23 from tailgate to top of seat due to angle of seat back, with seat(s) folded there is acres of space. They fold split 2/3 + 1/3. tax I think is £130, If you are looking at 2nd hand you need the 2 ltr HDi- which is turbo NOT the 1.9 Forte, as the HDi has miles better fuel econ and also a better top speed than the 1.9.
I have a 'hampster baskets' crate and had to 'shrink it buy 2" to fit in space. I also fitted an 'extention' to make it taller as had limited hight in old car and when we put crate in Berlingo which is taller Zuma sulked like mad as he couldn't see over top of seats or look out of the windows :-D