34K with 4K down should be 433mo @ 2.99
38K with 4K down should be 488mo @ 2.99
This assumes 6 sales tax and 800 doc fees.
You would be better off putting the 4K towards the camper downpayment as the rates are generally higher for campers/rvs. Putting zero down you only pay an additional $400 in interest over the course of the car loan.
As an example, that 4K towards a $25K camper on a 5 year loan @ 5percent would save you the $400. Smaller amount but the rate is quite a bit higher. I hate giving banks money.