If the plane has a cowl, the Dubro fueler is probably the best option. If not, there is another option for a 2 line setup.........
Sometime quarters are so close that it isn't easy at all to disconnect the line to the carb for each fuelup. I use a hand crank fuel pump and install the GP fuel fittings (around $10) set into the cap of the fuel jug. Here's the setup.

From the LHS get a "T" fitting. Make sure the ID of the "T" is at least as large as the ID of the tubing you're using. Install the "T" in the line between the fuel tank and the carb/fuel inlet. Attach a short piece of tubing to the 3rd. leg of the "T" just long enough to extend upward and clear of those cramped quarters. This will be the fuelup point. Rather that plugging this line by running a screw into the open end after fueling, the LHS should also have a plug or the plug used by a fuel dot. Also, there are small clamps available to put around each connection of the "T" to lessen the chance of leakage.

The fuel jug and fittings set.....to pump from the jug, a piece of tubing goes inside with a filter on the end. The pump is connected to one fitting installed in the cap that is connected to this tube. The pressure/muffler line is removed from the engine and connected to a piece of tubing going back to a second fitting installed in the jug cap (a closed loop type of setup). All these fittings are included in the set...just need to purchase a few extra feet of tubing. When the tank is full, the overflow flows back into the jug. Then, reconnect the muffler line and insert the plug into the "T" that was used to fill. To defuel the tank, simply reverse the pump direction with the same connections until the tank is empty.

Others probably have more if not better suggestions but this one works well for me.