Oil Cooler or not...?

[Bundy]

I currently have a happily running EJ20 N/A engine in my Baywindow.
Recently changed the cooling system and I'm now running lower temps than I've had before...but these are possibly relative as it wasn't exactly warm when we went away at Easter.
Anyway, I'm fitting a towbar and will be pulling a Rapido folding caravan in the future. I'm also off to Europe this summer and will be staying in the Alps so there's going to be some serious heat getting generated.
I have a Mocal oil cooler, long pipes and a thermostatic filter housing to fit, but do you think it's really necessary or am I just asking for more issues with possible leaks and possible pressure reduction?!
Any thoughts, comments or experiences welcome

Thanks in advance
Al