-the huge writing to me is just too large, i prefer subtle and simple in this case.
-the message i'm trying to achieve is telling the customer who we are when we arrive. they can see with this when a blue car pulls up that it's us.
Ignoring everything else, because it's not what you wanted which is fine, i'm going to comment on these 2 parts.
Subtle and simple isn't going to get you noticed when you're driving around and if the entire point of this is telling the customer who you are when you arrive, why not scrap this idea and get a simple ID card made up, or company tshirts/jackets etc.
You can even send them an email of who will be arriving so they know in advance and it's an added layer of security, or tell them over the phone that they will have ID. This is what we do when we are confirming appointments and customers love it. Add in a phone call or text 15 minutes before you are due to arrive and it's really putting across excellent customer service.
Honestly, the overall design on that vehicle doesn't say professional company to me which I know from your previous posts is an import part of the company image, you've put a lot of thought and effort into it.
You've also got to consider, that if they've booked you already and you're turning up to an appointment with them, they don't need to know what services you offer. You could scrap them altogether from the design and just have a larger company name + phone number.
From what you've said I would probably look at keeping the font the same, removing the services offered and then splitting it over both doors as acharris says.
At the end of the day, it's your business and your vehicle, if you're happy with the design then go for it
How are you getting it added on? painted or a wrap of some sort? Magnetic options are a good idea as they can be removed as an when.
Is it going to effect your insurance? I know you'll need business anyway but does putting the signs on effect it? It's something I've considered for mine but never really looked into.