Spring rolls come in two basic varieties: the crispy fried one and the 'fresh' one. The latter you usually find in Vietnamese restaurants. And also at this particular roadside food stall which does the dish really well, giving 'proper' Vietnamese restaurants a real run for their money!
Fried spring rolls in Thai are called "po pia thod", the cold variety "po pia sod" (sod=fresh). This turns it into a kind of sandwich-roll / sandwich-wrap with all kinds of ingredients. This stall does a particularly nice variety, using a pancake/burrito like wrap with crab meat on top. Really delicious! They go for 20 baht for two or 30 baht for three, and come with a sweet sauce and disposable chopsticks..
Location: Finally something in a touristy area of town! On Charoen Prathet road, on the left side before you get to the Porn Ping Tower Hotel and Diamond Riverside hotel. This one is on the left side of the road when going in the direction of the one-way traffic, in front of a noodle restaurant.
Looking at the first picture only now do I notice the bottle of French's Mustard on the cart...! Would people actually order fresh spring rolls with mustard?! :-O It's a highly touristed area so it wouldn't really surprise me.. And it could be worse of course.. could have been tomato ketchup.. 8-)