Id take it a step further and ask what exactly is offered in marketing/social media/SEO that makes him competitive in the first place. The idea that an agency was formed, because the feedback he got to start an app turned him off of doing so, isnt exactly a positive selling point.Way too broad of services - I'd eliminate consulting, legal, CRM, and SaaS development.
Focus on marketing, social media, and SEO - will be a far easier sell.
And the easiest way to sell to dealers is having a proven track record of driving results. Getting the first client is the most difficult. Find a dealer, offer your services at pennies on the dollar, blow their sales up, use them to get you in the door at other dealerships.
Being brand new, there's no existing clients for referrals, no proven results, etc. At this point, the forum is more of a consultancy for his own startup, than the other way around.
He should run some social media ads, generate some leads, and start from there to test his own strategies. Similar with paid search or anything else he plans on offering.
"agencies" that come and go are a dime a dozen. Plenty of dealers burned by overpromising the world.
My gripe about SEO is probably long in the tooth, but Im of the opinion that if one cant rank their own business on google search, then they have no business in selling SEO service to anyone else.