In case all fails don't be discouraged.
I pulled the frig from my 81' Burro
sectioned it off and put in a Walmart air conditioner. We even got another storage area above the AC for pans and such.
Oh yeah. nice and cool. For a refer we use the Coleman 12v hot or cold. Had that for at least 5 yrs now and it works fine.
I usually leave it in the back of the van and hook up to 110v when not traveling.