Hello Ben,
Here are my thoughts on your system:
A good price, no doubt about that.
An optional RO unit would be nice for those who live in hard water areas
Maybe too many poles, I dont know of many ppl who use an 8ft, but you did say for a lower price you can have fewer.
460 Litre tank is a good size, but customers need to know that this would only be appropriate if their vehicle's payload weight was enough. For example my van will only hold a 300 ltr system, but as you say, if requested you'd be able to supply a smaller tank.
Tricoflex hose is the best, so good on you for choosing it.
Is it a self-install system? I would be concerned about the system's security in my van if it wasnt fitted by an expert.
-Philip
PS I'm not meaning to critisize your system in any way, just give my honest opinion. If you would like me to delete this, I'll be happy to.