Yes, I think that it should be a fairly simple install as we want the connection to enter directly behind the main TV which we hope will be a good spot for the modem and router. BUT you know how that goes - what sounds simple and inexpensive to me ends up being dollar signs in the eyes of the installer !!!

Our 2007 Montana had a jack that went straight through the wall. Outside was a weatherproof jack, and inside was a standard jack in a plate. Not sure where to get it but it would be easy to install.

DSL will use regular telephone cabling.

Here are a couple of interesting articles that might help one understand a little better:

https://www.lmi.net/support/how-dsl-works

https://www.techwalla.com/articles/ethernet-cable-vs-phone-cable

https://itstillworks.com/dsl-modems-use-regular-phone-cords-17983.html

Connecting bell (as it used to be called) is a simple project. Anyone can do this this. But I'll even have to admit...I haven't heard the term DSL in years 🙂

It is a hard-wired connection and IMHO, a lot more secure that wireless. Just not as fast. But then, who is in that big of a hurry?

DSL uses hardwired copper telephone lines and as such the quality is dependent on the condition of the copper lines and connections ultimately back to the ISP's local office. Distance from that point is also a factor in quality of connection and speed.

Thanks everyone for your input. We have traveled very little in our rig as I have just retired this month. We will be taking off soon though once the sale of the house is finalized.We will need wifi for the computer, tablet, phone and to stream to the TV's. It was suggested to me today that I might want to try Direct TV for internet and that they may be willing to turn it on and off as we need it. If we do the DSL connection when we are at our home base, then we will not need any other methods. I don't find that wifi is very good at most of the campgrounds where we have stayed. Would love to hear from you as to how you have solved that problem.

Most parks we have visited don't have the phone hook-ups at each site that is required for a DSL, similar to what we have at home.

Therefore, we use a Mi-Fi system with a router. In Canada we use Bell, with a pay as you go package. If the park wifi is good we use the park, if not we turn on the Bell system, which is 3G/4G depending on reception. Range is about 600' and we can connect up to 10 devices.

In the US we used a company from Portland that was bought out. When we head to SoCal in January, I will research providers to find the best pay as you go plan for 4 months.

The Mi-Fi systems work off the cell system, so if you have no cell service, you also won't have internet.

We use an AT&T go phone (pay as you go) WiFi hot spot when traveling in the US, we get good results with 4GLTE service in most places. We don't stream so I can't say if it would work and at what it would cost. I get 6 gigs/month for about $50. You could also do the hot spot thing with a smart phone and an AT&T go phone SIM if your phone is unlocked.

At the park we stay at in California I can hook up a coax modem to their system and subscribe on a pay as you go internet, I'm going to try that this winter as well.

I agree with Andy, I can't remember the last park I was at that had a phone plug at the pedestal.
We use the unlimited miFi Jetpack with Verizon, pricey, but has worked all across the country with only a couple very remote spots there were no signal.
Most parks WiFi is weak at best & will not allow streaming movies, but it's FREE.

We use DirecTV to Television and Verizon for Cell Phones, Tablets, and Internet with a MiFi Hot Spot unit.

Verizon MiFi for some. $54 mo.

Charter Internet for some. $52 mo.

Cable services are still somewhat common at modern, private campgrounds.

Dish can be turned on and off but the last time I checked, it was monthly only. That won't work for us.

I never use campground Wi-Fi. Security is usually "0". I only use the Verizon Mi-Fi because it acts as a personal Hot- Spot.

Getting back to the OP’s original question, there is a cheap, easy and reasonable solution. In your wet bay, you may have a cable, or sat, or even 2 sat inputs. Decide which you don’t use or need to use. Trace the line inside (mine are behind the main TV in cupboard). Once does you can either take the plate off or leave it on (it’s up to you). You put what is called a Balun on either end and you have the two wires required for telephone or DSL. Baluns can be bought at local surplus, Network, or even amazon stores. I understand wanting DSL at your home base. Good luck.

Would you mind telling me how much the unllimited mifi jetpack from Verizon costs per month?

Two phones, unlimited calling/texting, monthly payments on the I-phone, unlimited data & the jet park run $240 +/- a month. The jet park is $50 a month, when got it 4 years ago, plus different data plans that are available.

Just another easy solution depending on your set up at home. We have DSL at home and a wireless router, the WiFi signal from the router is strong enough that it reaches the RW in the driveway, I can take the laptop or a printer to the RW and they connect to the network and to the net.

That's a good point! He could just keep the modem and router in the basement somewhere and go wireless.