I am in similar situation mate ..I need new fridge for the Breakaway and i have been an engle man for many moons having used them in marine environment for the past 10 yrs I cant fault the engels.
that said the orientation of the new fridge slide and the width have me looking at weather the 60ltr engel is the best choice for me ..the contender is the ARB fridge that you spaek of but in a bigger size.
My research indicates its a good well thought out fridge with excellent product support, I am haeding to NW WA and the amount of ARB stockists up there is very good as well as a company store in Geralton ..so support is def there.
I like the design features of the ARB with drain bung , lid arrangement and the way the bag still allows ease of use, anyone with an engle that runs a cover will attest to the bloody nightmare of the cover and latch arrangement.
The arb also has the controls at the front and motor at the back, this is esp good if you are using a fridge slide, tie downs are well thought out and the overall unit is well finished.
That said I love my 40ltr engle but the 60 has few niggling issues with design and incorporating it into my camper like hinges sitting proud and side mounted plug . so based up fitment and ease of use I am leaning towards the ARB 60/78 over the engle in similar size offerings. the other big plus is the units weight in the 60ltr the ARB is 8.5KGS lighter and in the 78 it is 11.1KG lighter that's a big difference in unit weight alone that is also factoring in my decision as it will sit over the front of the camper. Noise of motor is also in play as it will slide under the bunks it will be inside with us at night and the swing motor is a few Db higher than the secorp in the ARB.
be aware the engle offers no low voltage disconnect ..this has never bothered me but just good for you knowledge.
Both units are very sound from my research
All in all I dont think you could go wrong with either offering and it will come down to what fits and suits you best, I am still undecided and will take the bride to look at the internals of the ARB unit this weekend as she is used to the engle baskets so need her to see it (apparently you cant see anything in a photo
)
For me it will come down to what fits best and what is the most usable in that space ..as I feel both are high quality ..both are backed by good product support, both offer good resale value and both have good reports from consumers.
Best of luck
jet