I've seen a few posts about installing a heater craft heat system and I'm considering doing the same. Can anyone tell me which unit/system I should get? It looks like most people have a 3 tube/hose system with 2 ports on the walk through and one behind the driver. I looked at the heater craft web site and they have a sport series and a pro series? Plus, their 3 port system only shows 2 tubes/hoses and one Fixed Louver? Any help on which system and where to purchase it would be greatly appreciated. Oh yeah, it's for a 2008 mobius LSV.