I bought petrol so I don't have to worry about getting it re-charged when I go away for a golf weekend. I have an EZGO RXV which has a 20L tank. Uses no more than 1 litre each round, so it only needs refilling once in a blue moon.
Both types should be serviced at least once per year. Petrol ones need filters, oil, spark plug, etc. about $100.
Electric carts need new batteries every five years or so, currently $1300 for a set of Trojans. Lots of electronics to go wrong.
Petrol carts are a little noisier, the occasional whiff of engine fumes and a moment longer to go when you put your foot on the pedal. Newer electric carts have auto electric brakes (take your foot off the pedal, it stops and stay stopped until you go again). Petrol carts have a locking brake pedal. If you don't release it, the accelerator will.
Both types are reliable and do the job admirably.
As for cost, $4000 should get you either type, under 5 years old with no more than 200 hours on the clock. Insist on new batteries if you get electric.
For a tilt trailer, Major Trailers in Bendigo are favoured by many cart sellers, around $1600 with 2/H tyres. My spare kept going down and I had to get it re-tubed which was cheaper than taking it to Bendigo. The paint on mine was so fresh it just about washed off. Seems like only one coat.
There's another tilt trailer maker in Bendigo. I can't remember their name but should be easy to find. Similar pricing.
Don't stuff around with ramps, just get the real thing.