vaccination

hello I had a few questions. I’ve seen some posts recently about some vaccinations for flea and ticks have cause long term problems for their dogs such as seizures. Me and my spouse go camping a lot and our new puppy will be joining us when the time comes. So I'm concerned mostly about ticks...

So is Leptospirosis better when give in the combo or the single vaccine? Nero has his wellness check today. The vaccine schedule they have seems normal but I don't like the last one where he gets a combo, and the lepto, and a 1 year rabies. I'm really worried about too many vaccines at one...