Roads in and around Surin are generally good but go out from the major towns and you'll likely encounter roads with potholes, so if you're travelling a bit then a car or jeep type of vehicle is needed. Mitsubishi Tritons/Toyota Hilux are plentiful

In the same boat as you. Used an agent 2nd time around. They submitted all usual documents. TGF is not working, so very difficult to prove she had something to return to. Even though she has a house, some cattle, a truck, family and friends in the area, 1st application was refused. If you said she worked in a salon she'd have to show money in her bank account from the salon. In the end we said she's not working, that I support her, and cross referenced bank accounts to verify money was from me to her. The visa company probably mentioned the same to the Embassy staff. Your own invitation letter will state you promise she won't overstay the visa.

I thought again the visa would fail but thankfully it was approved. Airport bound next Thursday to collect her :) Key Visa in Pattaya is who I used. 10k thb upfront + 20k if successful.