if you are DIY inclined this is a very easy install:

You can get a 1000w inverter for less than $150, and a changeover shore power switch for less than $100. All of this wires in to the same cubby where your converter is, assuming you have space for them. Other than that you need about 10' of extension cord.

Shore power switch goes in between the outside plug and the power converter. Solar charge controller hooks to it too. Cut the male end and 2' of the extension cord off. It plugs into the inverter and to the last spot on the shore power switch. The battery connection runs to the inverter. This setup allows the camper to auto switch depending on if it is sensing power from outside at 120v. If it does it switches over to protect the inverter and wiring. if it doesn't, it will power the power distribution center from the inverter and batteries.

I did that from memory so don't use it as install instructions. I just wanted to highlight that it is not a very in-depth process. and as long as you don't try to install it with the shore power or batteries connected it is very safe. This setup would charge phones and run a TV. If you have a microwave it will depend on the power level. You might go to a 2000w inverter to be safe.

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I would consider upgrading your batteries if you are still running on the stock marine battery it probably came with. I would go with a pair or two of GC2 golf cart batteries if you have the weight allowance and space. They are very effective for their price. If you cannot afford that in weight you can spend money and go lithium. I would shoot for 200-400Ah to go for a full weekend depending on your use.

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edit: some links

1500w inverter: https://www.amazon.com/dp/B01COA0UTE?ref_=cm_sw_r_cp_ud_dp_36TZVH3CCSXQ372S48GK

shore power switch: https://www.amazon.com/dp/B00153EYTO?ref_=cm_sw_r_cp_ud_dp_XK6DJZBNK9ZTV3AG800K

Those together are about $375 shipped. You can find better deals if you want. I would ask what the dealer is actually installing. This setup would power all the outlets in the camper though, so I would say $3000 is very high.