One wimpy fan is marginal at best. Add another or buy 2 new ones (cheap on Flea Bay) and move them to the upper cavity right in front of the condenser 9on the top of the tubing) blowing out the upper vent panel and optionally, a curved aluminum sheet baffle fitted behind the condenser fastened to the inner-outer framing (Suburban supples that baffle or you can make your own). That will solve your warm fridge issue. In reality, the only place you need to artifically transfer heat is the condenser at the top. The tubing is inconsequential.
You still need to practice efficient cooling essentials, like parking where the afternoon sun isn't on the fridge side.
You already have one thermostatically controled fan so the thermodisc and wiring is already in place. Just move the fan(s) to the upper cavity blowing out and you'll be good.
Additionally, check the insulation between the fridge and the outer cabinet as well and add additional insulation if needed (probably is). R12 unfaced insulation is cheap. Stuff the space all around the fridge full
